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Opisthius richardsoni

Opisthius richardsoni
Olympic National Park, Clallam County, Washington, USA
May 22, 2007
Size: 1.0 cm
Identified from a photo by David H. Kavanaugh, Senior Curator of Entomology, California Academy of Sciences. Found on sandy, silty, and gravelly banks of medium to large streams all over western North America. More photos and a short video clip at Opisthius richardsoni.
Species page from University of Alberta says this species is similar to the genus Elaphrus (see below). Carabidae; Carabinae; Opisthiini

(Originally misidentified by comparison to a photo labelled Elaphrus riparius in Peter Haggard & Judy Haggard's Insects of the Pacific Northwest.)

Images of this individual: tag all
Opisthius richardsoni Opisthius richardsoni 2 - Opisthius richardsoni

Also see
Another sighting:

Moved from Carabinae. to species page, freshly erected.

I don´t know which species it is, but
. . . for sure not riparius. The latter I know well, and it is in fact very similar to the americanus picture.

Corrected ID
David H. Kavanaugh, Senior Curator of Entomology, California Academy of Sciences, identified this for me from the photo as Opisthius richardsoni. Hope I've edited the entry correctly.

What to check
Do you have a suggestion on how I could track this species down further? I have two specimens and a dissecting scope, but don't know where to find an appropriate key. I could also try to contact the Haggards.

. . . no idea about a key on nwearctic Elaphrus. someone else may know. The species you have looks pretty distinctive, and I guess it will easily been identified unless you have a key (or a specialist recognizes it).

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