Hi Peter. I keyed this out last year,. I usually start with Ball and Bousquet's key in Arnett. Then I usually run things through a taxa specific key (if I have one available) or the keys in Bousquet's Carabids of the North East, (even though I'm to the south of the area covered, I find it is a good way to force myself to take a critical look at the specimen again). I especially try to do this if it is a taxa I don't see very often or that I'm unsure of. Mioptachys, however, is quite common in this area. I have dozens of specimens from SE Pennsylvania and southern New Jersey. In DE, I only have four specimens. Three from Holts Landing SP and one from Prime Hook NWR in Dover Co. The Prime Hook specimen got damaged somewhere along the way and is missing the head and thorax. As I key things out, I do make extensive use of Bugguide as my virtual reference collection. I am always happy to yield to others with more expertise that me, so it there is any thing specifically that you have a question about or need me to clarify for you please let me know and I'll be happy to give it my best shot.

added to the post-2012 Caraboid Registry. We appreciate your explanation and scientific contribution.