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Photo#164289
Bembidion patruele

Bembidion patruele
Tippecanoe County, Indiana, USA
June 15, 2005
Size: 4 mm
Bembidion patruele.

Characters used to determine sp: process between middle coxae margined, discal elytral setae not in contact with striae, frontal furrows not prolonged onto clypeus.

Bembidion patruele
and your other (B. rapidum) belong to the speciose subgenus Notaphus which I have studied in great detail due to the difficulties in separating several of its member species. The most convincing feature in photo (not mentioned) that distinguishes this species are the presence of well-defined tear drop shaped supraorbital punctures that lie distinctly separate from the inner rims of eyes. I will e-mail you my compilation of an identification key to northeastern Notaphus that supersedes all others published.

 
Aha!
That feature should be helpful in discriminating this species. And thanks for the information you are sending (and have sent).

I have a large UV light sample from this summer with TONS of Bembidion. I haven't really tried too much IDing these guys as they are so frustratingly speciose (although it is a really cool genus). I'll probably post more at some point.

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