Elaphrus
There are four British species all of the same general and very charactistic appearance and so distinct from all other British carabids. All are found near water. Our species are separated thus:

1 Head not broader than pronotum (use a measuring eyepiece and manipulate the specimen to eliminate artifacts.) Tibiae dark, shining metallic. 2





- Head broader than pronotum. Tibiae in some part pale. 3