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Entomology (Study of Bugs)/Could you please help me identify these bugs?

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Question
Bug picture 1
Bug picture 1  

Bug picture 2
Bug picture 2  
These are 4 to 5 milimiters long

Not too fast

Don't jump nor fly

Don't seem to bite

I first found them in the kitchen, but now I am finding them in some closets

The have a semi-hard shell



I sprayed them with insect killer 30 minutes ago and the bugs are still alive! They don't seem to be affected at all.

Thank you

Answer
Adriana:

I am changing your question to "public" because you include nice images and I know there are many other people out there who probably have these insects in their pantry.

The insects are beetles in the family Silvanidae, known collectively as "flat bark beetles."

http://bugguide.net/node/view/13072

Here's a link about how to prevent and control them:

http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7452.html

The "sawtooth grain beetle" and "merchant grain beetle" are the likely species for what you are showing here.  Might be one or the other, or both.

It is important to find the source of the infestation, and discard the product.  Store all vulnerable foodstuffs in glass or metal containers with tight-fitting lids.  Plastic bags and cardboard boxes offer little resistance to these insects.

It is entirely possible that the product was already infested when you purchased it.  Consider alerting your grocer so that they can contact the company that makes the product.  You might also ask for a refund, or a replacement for the damaged product.

Hope this helps!  I would *never* use any kind of chemical control in the kitchen, and avoid using them indoors at all.

Eric

Entomology (Study of Bugs)

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Eric R. Eaton

Expertise

I answer insect and spider identification questions ONLY. Attach images if possible. No "what bit me?", "what do I feed this bug in captivity?", or science fair project questions please. NO TECHNICAL QUESTIONS ABOUT INSECT PHYSIOLOGY.

Experience

Principal author, Kaufman Field Guide to Insects of North America. Professional entomologist employed previously at University of Massachusetts, Chase Studio, Inc., and Cincinnati Zoo; contract work for West Virginia Department of Natural Resources, Smithsonian Institution, and Portland (Oregon) State University.

Publications
Author, Kaufman Field Guide to Insects of North America, Missouri Conservationist magazine, Ranger Rick, Birds & Blooms, Timeline (journal of the Ohio Historical Society). I have contributed to several books as well.

Education/Credentials
Oregon State University, undergraduate major in entomology, did not receive degree.

Awards and Honors
One of the top 50 experts in all categories for AllExperts.com, 2009.

Past/Present Clients
Principal author of the Kaufman Field Guide to Insects of North America, Smithsonian Institution (contract), Cincinnati Zoo (employer), Portland State University (contract), Chase Studio, Inc (employer), Arkansas Museum of Discovery (guest speaker). Currently seeking speaking engagements, leadership roles at nature festivals, workshops, and ecotours.

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