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For Insects, Spiders & Their Kin
For the United States & Canada
Photo#20657
Beetle - Arthromacra aenea

Beetle - Arthromacra aenea
Hemlock Bluffs, Cary, Wake County, North Carolina, USA
June 16, 2005
Is this a type of Darkling Beetle?

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Beetle - Arthromacra aenea Beetle - Arthromacra aenea

Tenebrionidae: Lagriinae: Anthromacra aenea
Only one, easily recognized species in the genus for North America.

 
perhaps A. robinsoni
A recent work, as well as one from 1975 lists three species for the Southeastern US. Similar beetles I have seen in Durham and Guilford counties seem to key to A. robinsoni, which is, perhaps, the common species in the NC Piedmont. See discussion at:


Tenebrionidae.
Your identification is correct. These were formerly in the family Lagriidae (long-jointed bark beetles), but are now lumped with the darkling beetles. The l-o-o-ng terminal antennal segment is distinctive.