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Beetle ID - Pasimachus californicus

Beetle ID - Pasimachus californicus
CaƱon City, Fremont County, Colorado, USA
June 8, 2009
Size: >20mm
I thought at first this was a stag beetle, but the antennae make me lean more toward Scarites sp. Any ideas?

Moved tentatively -- thanks for the [unforced] guess, Peter
Moved from Pasimachus.

close: Pasimachus

Pasimachus californicus
if forced to guess; based on locality + smooth (non-striate) elytra + short humeral (shoulder) caina + absence of blue along sides. The suggestion of a long pair of longitudinal depressions on pronotum is probably not real.

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