Maybe back to genus? The crenulate posterior part of the lateral margin of the pronotum is not present (it's just smooth and sinuate). The posterior margin of the pronotum also does not appear very strongly emarginate medially. I am noting this based on specimens, each of which clearly key to either sublaevis or subsculcatus.
The elytra also seem to be shaped a bit differently, at least for my specimens. The dorsal surface of the mandibles is distinctly striate throughout, which is another difference I personally noticed between my specimens (13 sublaevis vs 2 subsulcatus)...
This is probably sublaevis.

I looked at the key you sent and it appears to me that antennal segments 2-4 have dorsal carina. With that characteristic and others, I believe it is Pasimachus crassus, but I'm really not an expert. Thanks so much for sending the key, Peter.

of P. marginatus. Anyway, I compared your dorsal habitus image to my reference specimens. For now, it appears like my examples of P. subsulcatus based on proportionately short elytra, showing minimally convex intervals. However, your measured long body length of 34 mm would favor either P. sublaevis or P. strenuus, neither of which I have.

for the new information.