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Ground beetle - Olisthopus micans

Ground beetle - Olisthopus micans
Concord, Middlesex County, Massachusetts, USA
February 21, 2008
Today I found hundreds of beetles on the ice in the woods, and around the edges of the impoundments, and at Great Meadows NWR. It was a nice sunny day, with temps only 27 degrees. There were nearly as many beetles frozen in and under the ice. I collected about 100 beetles, and now the real work begins, shooting, editing, and posting.

Good ID
I'd go for O. micans rather than O. parmatus - as noted, the latter is larger and has bicolored orange and dark brown elytra (see Interesting to find them out and about at that time of year.

Thanks Peter
This is a new genus and species for the guide.

tribe Platynini : genus Olisthopus
was my initial impression based on general body shape. If true, then of the two species known in MA I would favor 4mm O. micans with unformly dark dorsum as compared to 5+mm O. paramatus with bicolored elytra.

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