NORTH AMEHICAN COMCOPTKRA. 221 



Opaque ; thorax transverse, sides strongly rounded, but not much 

 deflexed, finely alutaceous, closely punctate ; scutellum black ; elytra 

 tolerably rei2:nlarly punctate striate, margins pitchy. L. .10. North 

 Carolina and Kansa.<. 



It may be possible that the above species is merely a larger lu- 

 ridiim, Avhich varies in the distinctness of the frontal suture. 



CHKYSOCHIIS Redt. 

 The two si)ecies of this genus are so well known and so generally 

 found in all collections as to need no comment. They are. 



C. auratilS Fab.. Syst. Eut. 177"), p. 101.— Brilliant greeu with coppery 

 reflexions. 



Occurs in the easteau Atlantic region from Canada southward. 



C cobaltinus Lee, Pacif. R. R. Rep. 1857, p. 67. 



californicus, castaneus, tenebricosus Marsh. Proc. Linu. Soc. Zool. 1865. ]>. 

 49. 



Cobalt-blue, rarely with faint greenish tinge. 

 Occurs, as does aurains, on various species of Asclepias (milkweed), 

 and very abundant on the Pacific coast from Oregon southward. 



EUMOIiPUS Weber. 

 This genus is now represented in our fauna by one species which 

 was described by ine as a Chrysochus, from the fact that I failed to 

 appreciate the meaning of the characters drawn from the prosternal 

 episterna. 



E. surinaineiisis Fab., Syst. Eut. 1775, p. 96; Jacoby, Biol. Ceiit.-Aiu. vi, 

 p. 172. pi. ix, figs. 14—16. 



robnsfus Horn {Chrysochus), Trans. Am. Eut. Soc. 1885, p. 186. 

 Variable in color from cobalt-blue to green. 

 Occurs from southern Arizona to Brazil. 



TYMNES Chap. 

 This genus comjjrises those species formerly enrolled as Typophorm. 

 They are few in number ajid separable as follows: 



Metasternuni at sides comparatively smooth. 



Color variable, greeu, bronze or cupreous; elytra coarsely punctate even to 

 the apex ; apical angle acute, very slightly prolonged in the male. 



tricolor. 

 Color deep blue with violaceous reflexions; elytra not coarsely ami rather 

 sparsely punctate, at apex quite smooth ; apical angle not acute. 



violaceus. 



Metasternum at sides densely and coarsely punctured. 



Color piceous, slightly bronzed; elytra moderately coarsely punctured even to 

 the apex; sutural angle well defined, not acute luetasteriialis. 



TRANS. AM. ENT. SOC. XIX. JULY, 1892. 



