Entomology (Study of Bugs)/Insect identification


Bath tub bug
Bath tub bug  
Hello, I have found this insect in my bathtub on consecutive nights. We are from central Indiana. The bug pictured is the largest of the two, but it was the same bug. I can not tell how many legs it has due to the fact I fished it out of bath water and it suffered damage. I would like to know what it is so that I can discern how to eradicate it. T

Hi, Kelly:

The insect in the image is one of the grain beetles in the family Silvanidae.  Here is more information on them:



Personally, I would advise *against* using insecticides.  Simply find the source of the infestation and discard the item(s).  Store vulnerable foodstuffs in glass, metal, or durable plastic containers with tight-fitting lids to prevent future infestations (or at least contain existing ones if the product was infested prior to purchase).

The presence of grain beetles is not in itself a health threat, but it could be an indication of fungi or mold in the infected product.

This is not something requiring an extermination service.

Best wishes for quick and easy resolution.  Happy holidays, too!


Entomology (Study of Bugs)

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Eric R. Eaton


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.


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.

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.

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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