Key to the genus Placopterus (modified from Opitz 2011) 

 

1.    Pronotum with black spot. Eastern US and Canada. ... thoracicus.

 

-     Pronotum wholly reddish. Mexico ............................. 2.

 

 

2.(1) Elytra short, pronotum not darkened anteriorly. ...... plumbeus.

 

-     Elytra elongate, anterior pronotal arch darkened ...... rufipes.

 

 

Literature cited 

Opitz, W. (2011). Revision of the checkered beetle genus Placopterus Wolcott (Coleoptera: Cleridae: Clerinae). Proceedings of the Entomological Society of Washington, 113(2), 137-153.