AMERICAN COLEOPTERA. 01 



r.. ^ with the joints I — 2 of the anterior tarsi spongy beneath : 



Thorax semiopake, very strongly constricted behind; strise of elytra 



punctured. California 12. striatopunctatus Chaud. 



Thorax very dull, less strongly constricted behind ; stria; of elytra 



very coarsely punctured. California 13. pnnctatus Lee. 



(17 mm. Thorax gradually narrowed behind, elytra with rows of very 



fine punctures. California 14. subtilis Schaum. 



0. Ij«'gs stouter, antenniE less slender than in tiie other species, but little 

 longer than the head and thorax, second joint very little 

 shorter than the third; elytra granulated, and with rows of 

 large tubercles. Oregon and Vancouver...! 5. tuberculatus Harris. 



RemarJcs and si/nonyma. 

 2. C. VELUTINUS. — Though closely allied to C. an;ja^lico/li.s this spe- 

 oies is very easily distinguished by the bluish-black color, destitute of 

 lustre, and by the thorax being narrower, more gradually narrowed be- 

 hind, and more finely margined; the elytra are striate in the same man- 

 ner, with approximate rows of small points, but three of the intervals 

 are wider and more obvious, and the margin is very dark blue instead 

 of green. Specimens were collected in Southern Oregon and given to 

 me by Dr. Gr. H. Horn. 



,'). C. CRlSTATUS Harris. — This species is evidently C. rctimlatv.:^ 

 Motscli.; the description of Mannerheim (^BitU. JJosc. 1853,) is quite 

 iiharacteristic. All the specimens I have seen are from Northern Cali- 

 tbrnia. 



7. C. OBiiiQUUs, n. sp. — The single specimen which I designate by 

 this name differs from all the others before me, except 0. maryinattm. 

 by the thorax being strongly but gradually narrowed behind, with the 

 sides oblique and scarcely sinuate, not constricted. The elytra are 

 broad and ventricose as in C. punctntm ; the strise are deep, strongly 

 punctured, and the intervals are narrow and interrupted towards the 

 tip and margin. The color of the thorax is a very dull opake black. 

 us in C. punctatus. California, near Sacramento. Mr. S. S. Rathvon. 



10. C. CONSTRICTUS Lec. — This species, of which I found two males 

 near Now Alniaden quicksilver mine in California, differs from C. vr.u- 

 trirosns only by the thorax and elytra being rather broader, while the 

 insect is much smaller. It is evidently the species figured by Mots- 

 chulsky as ('. interruptus Men. 



11. C. VEXTRicosus. — I learn by the remarks of Dr. Schaum, i^Jicrl. 

 Eat. Zcit. I860, p. 71), that I was in error in placing G. striafoptnir- 

 (afun Chaud. as a synon^-m; and that the latter has but two joints of 

 the front tarsi of the male papillose beneath : this being the case, it 



