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Eucnemidae - Nematodes penetrans

Eucnemidae - Nematodes penetrans
Allegheny County, Pennsylvania, USA
June 9, 2015
Size: 6 mm (est.)
Lots of these on a fallen oak on our hillside. Thought they looked a lot like Nematodes sp.


the eucnemid....
is Nematodes penetrans.

looks like the ant is standing the ground
Moved from ID Request.

I think it's a beetle
I think that's another beetle inside the burrow. Some of these have really weirdly-shaped antennae. I'll go catch some and get some proper photos.

oh! the antenna looks totally geniculate...
...thought otherwise i can't make out much detail

Mating aggregation?
There were 3 or 4 of these chasing each other around, then the lead one went into that burrow. I just took this photo and went back to robber flies. Now I want to get them identified.

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