144 PALPICOllNIA — SrHAERIDIIDAE. 



Cercyon, 



A, Mesosternum distinctly separate from metasterniim. 



a. Interstices on elytra distinctly punctured. 



J. Length 1| — If lines. 



Oval. Head and thorax shining black ; elytra black, 

 passing gradually into reddish at apex, fourth stria almost 

 angular toward the front, making the fifth interstice wider 

 at "the base. Not uncommon. C. ohsolctus, Gyll. 



II, Length 1 — 1^ lines. 



1. Posterior margin of thorax not bordered. 

 A A. Upper-side very convex. 



a a. Elytra black at base, passing gradually 

 into red at apex. 



Short oval. Head and thorax shining black, latter with 

 a depression in middle of l)ase. Common. 



C. liaemorrhoidalis, Fab. 



b h. Elytra black, changing suddenly to red 

 behind, suture l)lack. 



Oval. Head and thorax shiny black. Common. 



C. hacmorrhous, Gyll. 



H J>. Upper-side moderately convex. 



a a. Elytra black, with the apex and side 

 margin suddenly red-yellow. 

 Oval. Head and thorax black, sides of latter red, fourth 

 interstice on elytra as broad as fifth. Moderately common. 



C. aquaticiis, Muls. 



h h. Elytra brown in the middle, with l)ase, 

 apex, and side margin, red-brown, and a 

 black marking at the base of suture and 

 anterior margin. 



Oblong oval. Head and thorax black ; elytra with fifth 

 interstice usually rather broader than fourth, their apex 

 prolonged into a blunt tooth beneath ; femora brown, knees, 

 tibiae, and tarsi reddish. Common. 



C. flavipcs, Fab. 



c c. Elytra red-brown, becoming gradually 

 paler toward apex, suture blackish. 



