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Entomology (Study of Bugs)/Mystery small flat oval grey-white insect

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Question
Phoenix, Arizona
I've never known what bug this actually is even though I've seen them here my entire life. As stated they're grey-white, small, flat, oval shaped insects with a with a clearly visible exoskeleton and antenna. They're approximately 2-3 times the size of a bed bug typically 1cm x 1/2cm.
Usually I find these bugs in very dusty areas, around rugs/carpet/etc. or dead from being trapped in glasses that have been in cabinets for long periods. They're more active during the evening time (about dusk or even later) I've observed.

Answer
Harley:

Without seeing at least an image (and preferably a specimen), there is no way I can even tell you whether this is a beetle, a true bug, a cockroach, or something else.

Making identifications over the internet is hard enough with the best of evidence.  There is nothing here to help me to help you.

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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