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Small Black Beetle - Blapstinus

Small Black Beetle - Blapstinus
San Pedro River Valley, SE of San Manuel, Pinal County, Arizona, USA
February 24, 2012
Size: small
Small black beetle, immobile from cold weather under a rock, any ideas? Thanks in advance.

Moved very tentatively
Moved from Darkling Beetles.

Moved from Beetles.

Moved from ID Request.

teneb... maybe of opatrine [in the old sense] extraction
unless an accurate measurement is provided, the size field is better left blank

doesn't look familiar. Maybe a Gonocephalum or an odd Blapstinus? Not Ulus or Metaponium (the other common desert 'under rock' species)

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