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For Insects, Spiders & Their Kin
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Photo#163729
Trogossitidae - Nemozoma fissiceps

Trogossitidae - Nemozoma fissiceps
Roger's Camp, Tulare County, California, USA
May 23, 1982
Size: ca. 6 mm.
These were crawling around on limbs that had broken out of a Giant Sequoia (Sequoiadendron giaganteum) after a winter of heavy snow.

Images of this individual: tag all
Trogossitidae - Nemozoma fissiceps Trogossitidae - Nemozoma fissiceps Trogossitidae - Nemozoma fissiceps Trogossitidae - Nemozoma fissiceps

Consider
Consider genus Nemosoma. The other possible genus might be Cylidrella, which lacks a lateral pronotal bead and has shortened elytra. I think I see a bead here. Five species are listed.

Consider consulting Barron 1971 (A revision of the Trogositidae of America north of Mexico. Memoirs of the Entomological Society of Canada, 75: 1-143.) This should solve your Trogissitid questions far better than I can.

 
Barron says:
I checked out Barron. Nemosoma fissiceps (Fall) is the only one that matches the color, with a reddish pronotum. The head is distinctly Nemosoma except there should be a fine unimpressed median line near the base of the vertex. I can't see it, but this has got to be Nemosoma. CA Sierra Nevada is right for fissiceps.

 
The line is there, its just v
The line is there, its just very hard to get it to show in a picture. Because I know it to be present I see it in the picture I posted, but its much more obvious on the specimen under the scope, but it appears to be impressed.

 
Moved to guide
Great to get this one to species.