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Photo#311608
Beetles - Calopteron terminale

Beetles - Calopteron terminale
Pennypack Restoration Trust, Montgomery County, Pennsylvania, USA
July 22, 2009
Found several of these near each other on the same plants. Two had those funny looking growths at the base of the elytra, others didn't. Any ideas?
Found in the same field as

Moved
Moved from ID Request.

Vassili, another one with an all black
pronotum! But the curved wings of terminale.

End Band Net-Wing
Calopteron terminale

http://bugguide.net/node/view/8197/bgimage

I'm not sure what the growths are though. They look like they're actually on the base of the pronotum, not the apex of the elytra, or they could be inbetween, its hard to see. Anyway it doesn't matter because I have no idea what they are, hopefully someone else will.

 
Little knobs
Yes, the more I look the more I see that those little growths are part of the pronotum. I wish I knew what they are.

 
I wonder
If its some sort of deformation just in the ones you found. I don't see anything like it on any of the other images of the species on the guide, but the pronotum does often curve right at the base there, and is often orange just on the edges.

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