AMERICAN COLEOPTERA. 155 



c. Elytra with more or less distinct rows of punctures, posterior declivity 

 broadly sulcate near the suture : 

 Thorax finely punctulate behind, with a large patcli of hair each side 



in front of the middle 17. comatus. 



Thorax coarsely punctured behind, without patches of hair. — Trvpo- 

 PHLfEus Fairmaire. 



Subsutural groove of declivity broad and deep : 



Elytra coarsely punctured in rows 18. pullus. 



Elytra coarsely punctured, but not in rows 19. pulicarius. 



Elytra more finely punctured in rows: 



Prothorax regularly rounded in front 20. atratulus. 



Prothorax slightly constricted near the tip. 2 1, nitidulus. 

 Subsutural groove of declivity very faint : 



Elytra more finely and confusedly punctured. 22. puberulus. 



8. C. retusus. — Cylindrical, slender, blackish-brown, base of elytra paler, an- 

 tenufe and feet yellowish; head prominent, convex, subcarinated, shining, 

 sjjarsely punctured; prothorax nearly one-half longer than wide, sides slight- 

 ly converging from the base and feebly rounded, tip strongly rounded, surface 

 rough and sparsely hairy before the middle, granules tolerably coarse near the 

 tip, behind the middle sparsely punctulate; elytra very finely rugose and dis- 

 tantly punctulate in rows, and with a few long hairs behind the middle, poste- 

 rior declivity with a deep depression along the suture, limited each side by a 

 longitudinal obtuse elevation, bearing on its highest portion a few very fine 

 deuticulations; suture not elevated. Long. .3-5 mm. 



Collected in the coast region of California and Oregon by Dr. Horn. 

 This species has the same form and sculpture as C. mater iar tux, but is 

 larger and readily distinguished by the different sculpture of the pos- 

 terior declivity of the elytra. 



9. C. sulcatus. — Form, size and sculpture precisely the same as iu C. retusus, 

 except that the front is divergently aciculate, and the occiput is sparseh' punc- 

 tured ; the elytra are similarly punctulate in rows, but the general surface is 

 more distinctly and densely rugose; the retuse elevation of the posterior de- 

 clivity of the elytra is but slightly prominent, and not denticulate; the hairs 

 behind the middle of the elytra are less numerous. Long. 3'5 mm. 



One specimen from the coast region of middle California, given me 

 by Dr. Horn. The color is paler than that of the three specimens of 

 C. retusus now before me, being yellowish-brown, with the base of tlie 

 thorax, and the sides and tip of the elytra darker. Probably more 

 mature specimens would be darker ; it is perhaps the female of the 

 preceding, but having failed to find any sexual characters in C. ma- 

 teriarius, I am not warranted at present in so regarding it. 



11. C. asperulus. — Slender, cylindrical, brownish-black, shining, nearly gla- 

 brous, antennae and feet yellow; head flat, feebly punctulate; prothorax one- 

 half longer than wide, feebly narrowed and rounded on the sides from the base, 

 strongly rounded at tip, very rough and slightly pubescent before the mddle, 

 but almost entirely smooth behind ; elytra scarcely punctulate, posterior de- 

 clivity with a few hairs, almost uniformly convex, with a very feeble subsucu- 

 ral furrow. Long. 1'5 mm. 



