Hydaticus cinctipennis.
 
 
 
Photo: 05/27/18, noon.


Hydaticus cinctipennis can be characterized by its brown coloration of the body and the presence of defined lateral yellow margins on the elytra. I found this specimen and some of its buddies in the (water-filled) bed of my truck. Unfortunately they were quite successful in hiding under plant debris, which made it even harder to take a decent photo.  
 
 
bug guide (this photo):
https://bugguide.net/node/view/1525838