Elaphrus ruscarius
This beautiful ground beetle is from Hyco Creek in North Carolina. It is not a Bembidion, but it is a carabid beetle, as are Bembidion. The genus Elaphrus has many spectacular species. Here’s another species from the same habitat:
Elaphrus lindrothi
David Maddison
The Subulate Palpomere 
If it weren’t for tiger beetles, those would be the prettiest carabids I’ve ever seen! 🙂
Are those alive or dead? Nice choice of substrate for the photographs.
Yes, they are lovely, aren’t they! The specimens are freshly dead, photographed before they stiffen.