Dyschiriina is a subtribe of carabids that include small, fossorial (they live in tunnels in the soil) members. I found the one above on a river shore in Missouri. I love the interesting form of the beetle, and the delicate amber of the elytra.
Dyschiriines are unusual in that they have odd plate-like sensory structures on the palps (appendages around the mouth). These sensilla differ between males and females, and their function is unknown.