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Photo#680016
Large Foliage Ground Beetle - Lebia grandis

Large Foliage Ground Beetle - Lebia grandis
New Salem, Franklin County, Massachusetts, USA
July 25, 2012
Size: 8mm

size
8 mm is about the mid-range between L. grandis and L. atriventris, so this could be either one

 
I was thinking L. grandis because the grooves in the elytrae seem to be more pronounced inn that species. Maybe that's not a good distinction.

 
It may be a good character
I haven't seen it used in keys though. But I think you are right about this being L. grandis.

Another thing to look for, from Ciegler (1), is that L. atriventris has dark palpi and darker antennae, compared to L. grandis which should have light-colored palps and antennae (though I wouldn't say the antennal distinction is always reliable)

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