Carabidae ID help please

Carabidae ID help please

Observation - Carabidae ID help please. Description: I have somehow ended up studying carabids (among other soil beasties) for my MSc project! Struggling along with the old RES key until I can borrow the new one. Keyed this one to Calosoma which I am pretty sure it is not! It is 13mm long (excluding antenna

I have somehow ended up studying carabids (among other soil beasties) for my MSc project! Struggling along with the old RES key until I can borrow the new one. Keyed this one to Calosoma which I am pretty sure it is not! It is 13mm long (excluding antennae), black with striated elytra. Any ideas where I may have gone wrong?