Category Archives: Pantry Beetles, Grain Weevils, Spider Beetles, Meal Worms and Carpet Beetles   rss

What's That Bug? does not endorse extermination

Carpet Beetle Larva

Carpet beetle larva from MN
Hello Daniel and Lisa.
Thanks to your site, which I visit almost daily now, I was able to identify a carpet beetle larva when I first saw it last year crawling up the wall in my room. Now I found another one this year in the same place and time, and now I have a better camera for getting a decent picture of it. I noticed that you made it the Bug of the Month for April, and the picture you have up there is a little blurry, so I thought you might like some clearer images. I’m still not sure of the species of this one though. I live in Brooklyn Park, Minnesota.
Joel

Hi Joel,
Thanks for providing us with a sharper and more current image of a Carpet Beetle Larva. We scoured the archives for the one we originally posted in the Bug of the Month for April 2008 posting.

Carpet Beetles

can you help me identify these bugs?
Hello,
I found these bugs in one of our storage units. Can you tell me what they are? I attached a photo. thank you!
Dennis

Hi Dennis,
You have an Anthrenus Carpet Beetle infestation. Adult Carpet Beetles feed on pollen, and are usually noticed by homemakers when the congregate on windowsills in an attempt to reach the outside world. The larval form is the phase that does the damage. These fuzzy larvae feed on wool, feathers, fur and other animal products. They can do major damage in museum collections. Adult Carpet Beetles reach a length of about 4 mm. Your beetles look like Anthrenus verbasci, the Varied Carpet Beetle.

Carpet Beetle

bug on windowsill
In the last week (first week of March), we have seen several of these tiny beetle-like bugs on our windowsill. We’re concerned that they might be from possible dampness in the wall – or are they from a house plant. It’s too cold here yet, so you windows have not been open for fresh air and bugs! Thanks for helping us identify this tiny bug. It’s about 2 millimetres long.
Lauren

Hi Lauren,
This is an Anthrenus Carpet Beetle. It and its siblings have probably been living all winter in your home as fuzzy larvae, feeding on wool, feathers or fur, or some other animal product. Carpet Beetle infestations can do major damage to your valuables and are considered one of the most serious threats to natural history museum collections. Adult Carpet Beetles emerge in the spring and are attracted to windows. They feed on pollen as adults and are trying to get outside to feed.

What's That Bug? does not endorse extermination

Bug of the Month: April 2008 - Carpet Beetle

bug on windowsill
In the last week (first week of March), we have seen several of these tiny beetle-like bugs on our windowsill. We’re concerned that they might be from possible dampness in the wall – or are they from a house plant. It’s too cold here yet, so you windows have not been open for fresh air and bugs! Thanks for helping us identify this tiny bug. It’s about 2 millimetres long.
Lauren

Hi Lauren,
This is an Anthrenus Carpet Beetle. It and its siblings have probably been living all winter in your home as fuzzy larvae, feeding on wool, feathers or fur, or some other animal product. Carpet Beetle infestations can do major damage to your valuables and are considered one of the most serious threats to natural history museum collections. Adult Carpet Beetles emerge in the spring and are attracted to windows. They feed on pollen as adults and are trying to get outside to feed.

Ed. Note: (04/04/2008)
It seems that daily we have been receiving multiple requests for the identification of Anthrenus Carpet Beetles, hence our decision to make them the Bug of the Month for April. These Carpet Beetles can be extremely destructive to museum collections as well as to natural fibers in the home. The larvae are fuzzy and are the destructive stage of the insect.

Carpet Beetle Larva
(04/13/2008) Carpet beetle larva from MN
Hello Daniel and Lisa.
Thanks to your site, which I visit almost daily now, I was able to identify a carpet beetle larva when I first saw it last year crawling up the wall in my room. Now I found another one this year in the same place and time, and now I have a better camera for getting a decent picture of it. I noticed that you made it the Bug of the Month for April, and the picture you have up there is a little blurry, so I thought you might like some clearer images. I’m still not sure of the species of this one though. I live in Brooklyn Park, Minnesota.
Joel

Hi Joel,
Thanks for providing us with a sharper and more current image of a Carpet Beetle Larva. We scoured the archives for the one we originally posted in the Bug of the Month for April 2008 posting.

Update: (04/12/2008)Thank you thank you thank you!!!
Thank you SO much for making the Carpet Beetle April’s bug of the month! We have been in this house for 3 springs now and have wondered what on earth those little things are! It’s nearly impossible to find info online for one bug out of millions! I have a question… I looked up info on what they eat, the larvae that is. It said they like wool carpet. Our carpeting is made from recycled milk cartons! We do have a pet rabbit, but the bugs tend to stay in our daughter’s room, which the bunny is only allowed in on occasion. What could they be eating that keeps them coming back each spring? Again, thanks so VERY much! You have really satisfied a curiosity of mine and my husband’s (who, by the way, thought they were some bizarre kind of tick or flea!) Sincerely,
Crystal
Southern California

Hi Crystal,
Your letter is the second thanks we have received since making the Carpet Beetle the Bug of the Month. That is always a tough decision, and we almost chose the Striped Morning Sphinx. We have also gotten numerous requests for that identification. Your letter did not indicate if you are finding the adult Carpet Beetles or the larvae in your daughter’s room. If the adults, they could fly from the larval feeding source. If you have rabbits, they will probably shed and the larval Carpet Beetles will eat the shed fur. They will also feed on other pet hair and human hair that gathers in corners and under beds.

Spider Beetle from UK: We think Golden Spider Beetle

spider beetles, Niptus hololeucus, in the UK
Hi there bug lovers,
In the last 3 or 4 months I have been seeing these beetles in our city flat off and on (I’ve probably seen more than a dozen by now). I have been trying to key them ever since I saw the second one but never got any further than ‘bed bug’, which I know they are not, or assassin bug (which quite frankly is an even worse match). I have collected 5 of them (2mm -5mm, in all kinds of brown shades) in a jar where they ‘didn’t get to eat anything’ for about a month (appart from a dead spider which they seemed to have taken appart) until yesterday when I gave them a bit of old boilt rice (which they also seemed to like). We eat a lot of grain and health foods which means we have a lot of them around but they are being used and replenished regularly and I never noticed any batch to be parasitized. Although I’m sure that we must have a source somewhere I’ve never successfully located one. I have also recently noticed very few and small moth type holes in one of my boyfriend’s t-shirts and don’t know whether that could have been the bugs. The biggest bug (see pic of bug a grain of boilt rice) even has some really nice ornamentation on its back. Without magnification one can’t even see a suture on their backs but I did catch one flying once. Now, roaming through your site I finally found which species they should most likely be!!! I am sure they are some type of spider beetle, most likely Niptus hololeucus. However, no matter which site I find there seem to have been no sightings of this (American) species in the UK so far! If you could help me solve this riddle once and for all I’d be forever grateful! I have also attached pictures of two of my captured bugs. Thank you tons,
Julja
PS.: Since the last time I tried to contact you I have also found that they come crawling out of my downstairs neighbour’s drain sometimes and I have in fact seen one crawling out of one of our drains… ( abit weird for a bug that’s meant to feed on grains, no?)

Hi Julja,
We agree that this is a Spider Beetle, and also that the species looks correct. We googled some key words and found a great website on Spider Beetles with species listed and distributions. The Golden Spider Beetle, Niptus hololeucus, is listed as Cosmopolitan except for some areas of the tropics.

Spider Beetles

What is this little bug? (please help)
Bugman please help!
I live in Philadelphia and I keep finding these bugs in my apartment. I thought they were biting me but I am not sure. I have never seen anything like these things before in my life. Enclosed are two photographs of these bugs. I found them near my bed, which makes me terrified to sleep in it. They are round and shiny like tiny beads and are amber-reddish in color. They have those little legs and they are almost always dead when I find them. Also, when they are held up to the light they are translucent.
Scared in PA!
S.A.

Dear S.A.,
Fear not. These are Mezium Spider Beetles, grain infesting Pantry Beetles. They will infest your stored food, but will not bite you.

Expert Update: (05/22/2008) spider beetle errors
Dear Bugman,
I believe I had written earlier when looking at many of the spider beetle pictures. Almost all of the shiny brown, globular body, images are of Gibbium aequinoctiale and not Mezium species. There is a combined 2 image photo (finger and beetle & 2 beetles) of Mezium : the answer was posted by Eric Eaton, I believe. Gibbium species do not have a velvety covering on the thorax, Mezium species do. You should correct your website postings so people will have a better idea of what they have been finding. Best regards,
Lou
Louis N. Sorkin, B.C.E.
Entomology Section
Division of Invertebrate Zoology
American Museum of Natural History
New York

Dear Lou,
Thanks so much for resending this vital correction to our website. We really appreciate your expertise on this. We sincerely hope that addressing you with such familiarity doesn’t detract from your professional status.

Carpet Beetle

You have a great site. Thank you for providing a picture of an Anthrenus Carpet Beetle. I will now be able to put a name to pictures that I posted on chaindropz blogspot.
Thanks again
chaindropz

Hi Chaindropz,
Thanks for sending your photo. We have been getting numerous reports about Carpet Beetles lately.

Mealworm

what is this horrible looking thing???
Hello, great site you have here. Been browsing it for a bit but still cant find this little chap on there! Found him under my carpet, with the cat sniffing near it. Don’t know if it came in off the cat, or if there is something in the house… It was found near my fireplace, which is not used and has a gas fire in front of it. The chimney is boarded up, but not sealed. Thanks for your help! I’m in the UK, by the way.
Ian

Hello again,
As well as asking you, I also asked the Natural History Museum insect dept. for some help, and they have sent a reply. Just though I would let you know, so you don’t waste any more time on this enquiry! It is a the larvae from a mealworm beetle apparently, and can be found in roofs/attics/chimneys where birds nest. hence why I found it in near my fireplace! Thanks anyway, and keep up the good work on a fantastic site! best regards,
Ian

Hi Ian,
Thank you for your photo as well as the results of your inquiries. During normal business hours, we at What’s That Bug? are in the real world trying to make a living and normally answer questions early in the morning or late at night. We were unaware that the Giant Mealworm Larva, a Darkling Beetle in the genus Zophobas, were found in association with bird nests. It is very interesting.

Correction (03/28/2008)
I just wanted to point out that as Ian was told by the Natural History Museum, this is a Mealworm (Tenebrio molitor) which is not the same as a Superworm (Zophobas morio). Superworms are often confused with Giant Mealworms (the latter being a hormonally enhanced mealworm which grows larger for use as a feeder). While mealworms and superworms are both types of darkling beetles, they do have different appearances.

Mealworm Infestation

Help?
Hello,
Please don’t ask where I took these photos but these "bugs", I am guessing larvae of some sort, were discovered in a refrigerator and freezer which has had no power for numerous months and obviously wasn’t cleaned out prior to the power being turned off. They are approx 1 inch or so long and kind of a grey color. I have a couple more pictures if necessary. Several of these things were seen on the floor and what I would "guess" is excrement can be found in large quantities near an open bag of grits. Trails lead from the cupboards to the fridge. There were no flies to be seen in the house, only spiders and fleas. Estimated count is well into the hundreds. We would like to fumigate this place and clean it out really well but would like to know what we’re up against first. Can you help us out? Other than using LOTS of bleach, are there any special precautions we should take (gloves and respirator a given)? Thank you in advance,
Dave

Hi Dave,
Your image isn’t detailed enough for an exact identification, but your vivid description indicates Mealworms. Mealworms in the genus Tenebrio are the largest Pantry Beetles. The size you indicate as well as the food source, the grits, makes this a near certain positive identification. You do not need special precautions when cleaning, just a strong stomache.

Mealworm

Okay, I’m a little more calm now…
Dear WTB:
Long time reader, second time e-mailer… firstly, thank you so much for your wonderful website! It is an excellent educational tool and an essential public service! Thanks to you, my daughter is growing up to appreciate and love bugs (with the exception of wasps and hornets — she was bit twice last year) and, thus far, is not acquiring my neurotic hang-ups.
Please find attached pictures of a bug that I found this morning. He was kicking on his back in my darkened kitchen. I am not responsible for the damage to his one antennae and to a couple of his legs. This maiming was doubtless the work of my tiny perfect carnivore (domestic tabby cat). While on his back, I feared that he was an oriental cochroach. Having covered him with a translucent plastic container, I was able to slip a sheet of construction paper under him and tape the container down onto the paper, thus securing him for further observation and study. I spent a couple of hours on your website researching him and was quite convinced that he was an oriental cochroach until we managed to flip him over. Now, I’m pretty sure that he is a harmless species of ground beetle. He is 1.5 cm. long and .5 cm wide (5/8 " long, 3/8 " wide). He appears reddish-brown on his underside and black on his back. I can’t tell you how much I would appreciate it if you would view the pictures and confirm whether he is a beetle or a roach.
Sincerely,
Neurotic, fussy, home-maker (knowing it is half the battle)
near Toronto, Canada

Dear Neurotic, fussy home-maker,
Based on your self-evaluation, we are pretty certain we know what you will be doing the minute you get this response. We are relatively certain this is a Mealworm, Tenebrio molitor. We located a website with the following information: “Tenebrio beetles are black or dark brown and they feed as larvae and adults on grain products. T. molitor is an important post-harvest pest and occurs spread all over the world. Adult beetles are attracted to night-lights, are strong fliers, and are found in dark places. Each female lays about 275-600 eggs, which hatch into larvae in 4 to 14 days. Eggs are laid singly or in clusters during the spring over a period of 22 to 137 days. Larvae firstly eat the germs of stored grains and can feed on a wide variety of plant products such as ground grains, flour, tobacco and foodstuffs. Larvae are very voracious and highly resistant to low temperature; they can remain alive for 80 days at -5

Merchant Grain Beetles or Sawtooth Grain Beetles

Mastic Beach beetles
I sent you some pictures of the tiny beetles we have last week but it was from an email account I’ve been having problems with. I haven’t seen them posted nor did I get a reply so I’m sending you them again from an email account I know works. I’ve been through all of the beetle and ant pages and nothing posted looks like these creatures. Photos are all of dead bugs, the live ones won’t pose for me: IMGA0981 - several on the handle of a plastic knife; IMGA0989 - best I could do for a closeup of the head area
Thanks for your help.
Jeff
nevermind searching
I found the bug on another site, it’s as follows: Sawtoothed Grain Beetle (Oryzaephilus surinamensis): The Sawtoothed grain beetle is another very common pantry pest. It does not feed on intact whole grains, but feeds on many processed food products such as breakfast food, bran, dried fruits, nuts, sugar, chocolate and macaroni. It is especially fond of oatmeal and birdseed. These flat beetles can even get into sealed boxes and packages of food. Adults are nearly 1/4-inch long, slender, brownish-red and active. Their name comes from the six saw-like teeth on either side of the thorax behind the head. After finding a potential food, the female lays white, shiny eggs that hatch into yellowish-white larvae. There can be as many as seven generations each year, but sawtoothed grain beetles often stop breeding in the winter, unless buildings are heated and moisture is sufficient. Adults are very long lived and remain active in the winter. The habits and traits are a perfect description and I think the source is the food we get for our parrot. Here’s the link to the other site and a copy of the photo. Between my closeup and the description I think I have a match.

Hi Jeff,
Thanks for the information, and sorry we have been slow, but we could literally spend 24 hours a day answering letters, which is impossible. There is another closely related species, the Merchant Grain Beetle, Oryzaephilus mercator, that looks very similar. According to Hogue: “Its distinguishing feature is a small swelling on the head behind the eye which is lacking in O. surinamensis.” Your closeup seems to indicate this swelling. We favor the Merchant Grain Beetle.

Spider Beetle

Help with this one
I know my bug isn’t glamorous like a Luna Moth but I am really concerned about this thing and if somehow, not seeing any for 3 years, it has followed me from Chicago to New York. I sent a message a little over a week ago with a pic that wasn’t that clear. Hopefully these are better. He is pretty small so it is tough to get a good close up focus.

This is a Mezium Spider Beetle. They are pests in stored grain products.

Expert Update: (05/22/2008) spider beetle errors
Dear Bugman,
I believe I had written earlier when looking at many of the spider beetle pictures. Almost all of the shiny brown, globular body, images are of Gibbium aequinoctiale and not Mezium species. There is a combined 2 image photo (finger and beetle & 2 beetles) of Mezium : the answer was posted by Eric Eaton, I believe. Gibbium species do not have a velvety covering on the thorax, Mezium species do. You should correct your website postings so people will have a better idea of what they have been finding. Best regards,
Lou
Louis N. Sorkin, B.C.E.
Entomology Section
Division of Invertebrate Zoology
American Museum of Natural History
New York

Dear Lou,
Thanks so much for resending this vital correction to our website. We really appreciate your expertise on this. We sincerely hope that addressing you with such familiarity doesn’t detract from your professional status.

Anthrenus Carpet Beetles

mystery beetle
Greetings!
Can you please identify the bug in the attached photo? It appears to be some type of beetle. Actual size is just under 1/8 of an inch long. It’s very slow moving, and will sit motionless for long periods. Coloring consists of alternating gray and black bands. I live in Northern New Jersey, and this bug was found indoors in February. I’ve seen this kind of bug occasionally all my life, always indoors, and always just sitting motionless. I have no idea what they eat. They’re never around in large numbers, but I’ll see three or four throughout the year, in various parts of the house. They are not associated with the kitchen, or anyplace else where there’s food. Thanks! I hope you can tell me what this is.
Don Riemer

Hi Don,
This is an Anthrenus Carpet Beetle, one of the Dermestids. Here is what Charles Hogue has to say: “These are the common Carpet Beetles. The adults have conspicuous variegated patterns of red, white, or black splotches on the back. The larvae are stout and less than three times as long as they are wide; they have hairs along the body that are generally stiff and erect, and there are two tufts at the rear end. These beetles are hated by entomologists because they often destroy collections of dry insect specimens.”

Anthrenus Carpet Beetle

micro beetle
thanks for the past questions. i got a new bug for you.. whats this tiny micro beetle.
Charles

Hi Charles,
We thought this was a species of Carpet Beetle, and we have seen them on our squash blossoms. We checked with Eric Eaton and here is his response. “Ah, a carpet beetle in the genus Anthrenus! Please keep it away from my insect collection:-) You are correct that, outdoors, many species in the genus pollinate flowers in their search for pollen to eat. Eric” The larvae are destructive to collections and natural fibers.

Spider Beetle in Nursery!!!

Bed Bug or Flea?
My wife found this in our newborn twins’ nursery. We live in NYC and do not have pets. Very rarely have we gone out because it is cold out! Threw out the day bed and sanitized the nursery this morning. We thought it was a bed bug but it doesn’t have a head and the legs are long. Could it be a flea although it seems large? Definitely not a lady bug. It has long legs, no distinguishable head. It is flat along the sides. Can’t see if it has pincers. What do you all think?
Regards,
Jeffrey Hwang

Hi Jeffrey,
This is a wonderful image of a Spider Beetle in the genus Mezium. They are common household pests that infest grain products. It is harmless to your twins.

Expert Update: (05/22/2008) spider beetle errors
Dear Bugman,
I believe I had written earlier when looking at many of the spider beetle pictures. Almost all of the shiny brown, globular body, images are of Gibbium aequinoctiale and not Mezium species. There is a combined 2 image photo (finger and beetle & 2 beetles) of Mezium : the answer was posted by Eric Eaton, I believe. Gibbium species do not have a velvety covering on the thorax, Mezium species do. You should correct your website postings so people will have a better idea of what they have been finding. Best regards,
Lou
Louis N. Sorkin, B.C.E.
Entomology Section
Division of Invertebrate Zoology
American Museum of Natural History
New York

Dear Lou,
Thanks so much for resending this vital correction to our website. We really appreciate your expertise on this. We sincerely hope that addressing you with such familiarity doesn’t detract from your professional status.

Pantry Beetle Larvae

Help Please!!
Hi,
I have been finding these bugs in my pantry (mostly in dry pasta and flour) and they must relocate!!!! I have found one in an empty bowl cupboard and one in the soap dish in the bathroom. I find only one at a time (not in groups), sometimes live and some dried up or skins. The image is scanned and enlarged about 100 times; actual size is about the size of a grain of rice.
Thank-you so very much!!!
Amy
Canada

Hi Amy,
You have Dermestid Pantry Beetle Larvae, a common household pest that infest stored grain products. The best remedy is to toss out all perishables in the pantry and stock anew, keeping only what you can use in a short period of time.

Weevil

Bug??
We found this bug (.05 cm) in the carpet few days ago and today we found a lot more. There is any danger (there is a little boy, playing around) and, or were there usually come from. Thanks so much.
Daniel Correa
Miami

Hi Daniel,
This is some type of Weevil. They will not harm your little boy. They might be infesting stored grain products in your pantry and they sometimes infest pet food.

Grain Weevil

Bug Identification !
Hi there!
I’m Heather from Southern California, I recently have been finding lots of bugs all over my tiles and carpet area… They crawl really slow, and when touched or blown agaisnt , tuck there legs in. The pictures that i took are of the bugs on a 12inx12in tiles. If you could help me identify the bugs and let me know where they came from that would be great!
THANK YOU VERY MUCH!
Heather

Hi Heather,
This is a Grain Weevil, a type of Pantry Beetle. We are guessing they are infesting some stored food, possibly pet food or other flour product in your kitchen.

Spider Beetle

Hi,
I have found these guys a couple of times in my bathroom and was wondering what they were.
Sebastian Sparenga

Hi Sebastian,
What a detailed photo of a Spider Beetle from the genus Mezium. They are household pests. These tiny beetles will infest grain as well as exotic substances like cayenne, tobacco and opium. We doubt that you have an opium stash in your bathroom, but perhaps they are feasting on pet food, or shudder, the dead remains of an animal in the wall. Occasionally they will even eat woolens and other non-synthetic fibers.

Expert Update: (05/22/2008) spider beetle errors
Dear Bugman,
I believe I had written earlier when looking at many of the spider beetle pictures. Almost all of the shiny brown, globular body, images are of Gibbium aequinoctiale and not Mezium species. There is a combined 2 image photo (finger and beetle & 2 beetles) of Mezium : the answer was posted by Eric Eaton, I believe. Gibbium species do not have a velvety covering on the thorax, Mezium species do. You should correct your website postings so people will have a better idea of what they have been finding. Best regards,
Lou
Louis N. Sorkin, B.C.E.
Entomology Section
Division of Invertebrate Zoology
American Museum of Natural History
New York

Dear Lou,
Thanks so much for resending this vital correction to our website. We really appreciate your expertise on this. We sincerely hope that addressing you with such familiarity doesn’t detract from your professional status.

Spider Beetle

Last resort
I have been a faithful, daily reader for some time now and really enjoy your website. I have also been trying to identify these little critters but can’t seem to find them on your website. I live in St. Louis, they like my bathroom and at any given time there are 3 or 4 of them hanging around. They appear to have only 6 legs but are the size of a mite, maybe 2 mm. Please tell me they are nice bugs. They are so cute I don’t have to heart to kick them out.
Teresa Spitz
St. Louis, MO

Hi Teresa,
Granted, Spider Beetles in the genus Mezium are cute, but they are nonetheless, household pests. These tiny beetles will infest grain as well as exotic substances like cayenne, tobacco and opium. We doubt that you have an opium stash in your bathroom, but perhaps they are feasting on pet food, or shudder, the dead remains of an animal in the wall. Occasionally they will even eat woolens and other non-synthetic fibers. You could have found images of Spider Beetles from previous readers on our Pantry Beetle page.

Expert Update: (05/22/2008) spider beetle errors
Dear Bugman,
I believe I had written earlier when looking at many of the spider beetle pictures. Almost all of the shiny brown, globular body, images are of Gibbium aequinoctiale and not Mezium species. There is a combined 2 image photo (finger and beetle & 2 beetles) of Mezium : the answer was posted by Eric Eaton, I believe. Gibbium species do not have a velvety covering on the thorax, Mezium species do. You should correct your website postings so people will have a better idea of what they have been finding. Best regards,
Lou
Louis N. Sorkin, B.C.E.
Entomology Section
Division of Invertebrate Zoology
American Museum of Natural History
New York

Dear Lou,
Thanks so much for resending this vital correction to our website. We really appreciate your expertise on this. We sincerely hope that addressing you with such familiarity doesn’t detract from your professional status.