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TaxonomyBrowseInfoImagesLinksBooksData
Photo#341558
Probably Trox contractus or robinsoni - Trox

Probably Trox contractus or robinsoni - Trox
Hornsby Bend, Austin, Travis County, Texas, USA
September 30, 2009
Trox sp.
Det. W. B. Warner, 2010

Probably Trox contractus or robinsoni
There are three look alikes in that area that are pretty much indistinguishable without the male genitalia: sonorae, contractus, and robinsoni. Trox sonorae usually has dark antennal clubs, but...
Trox tuberculatus is also a possibility, but that species generally has longer elytral setae and more elevated tubercles; the four setal tufts that are diagnostic for that species would be covered in dirt in the above specimen.

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Moved from ID Request.

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