54 Natural History Bulletin. 



31 Pronotal fovese very large, not connected, the longitudinal sulcvis indi- 

 cated by an excessively fine line. Length 1.4 mm. - cavicollis. 

 ii Pronotum longitudinally impressed in the middle. 

 48 Head narrower than the prothorax. 

 52 First dorsal segment without carinie; elytral discal lines short; sculpture 



of the head feeble. - debilis. 



5I Two dorsal segments with short carinse. 



6* Elytra convex, sutural lines deeply impressed. 



Elytral discal lines one-half of the length of the elytron; im- 

 pressions on head and prothorax verj- deep. - fossulatus. 

 Elytral discal lines short, impressions on head and prothorax not 

 deep. .......-- fiunilus. 



61 Elytra depressed, plane, sutural and discal lines sharp, fine, and long. 



planipennts. 

 4^ Head as wide as the prothorax ; shoulders wider than head or prothorax. 

 72 Occiput sinuate, sides of the pronotum broadly, evenly, arcuate; sides of 



elytra nearly straight, divergent. 

 8* Occipital fovese large, nearer together, sulcus deep. - rotundicollis. 

 8^ Occipital fovete smaller, farther apart, 3 with two spines emerging from 

 under the third ventral segment. 



Pubescence inconspicuous. Length 1.3 mm. - - spinifer. 

 Pubescence coarse, erect. Length 1.6 mm. - - sexnalis. 

 71 Occiput convex, not sinuate; sides of pronotum sinuate behind the mid- 

 dle; sides of elytra arcuate. .... - iidcrruptus. 



41 Head wider than the prothorax. 



9^ Prothorax longer than wide. longicollis. 



9I Prothorax not longer than wide. 



lo* Shoulders slightly wider than the head, prothorax narrower. 



Prothorax wider than long, base of abdomen as wide as the 



elytra. - - - difficilis. 



Prothorax as wide as long, base of abdomen narrower than the 

 elytra. .....--- cotigcner. 



iqI Shoulders as wide as the head, sides of elytra parallel; form linear, 



depressed. 

 11^ Pronotum with a fusiform median canaliculation. 



Occipital fove?e widely separated ; head not punctured. Length 

 1.6 mm. - - - - - - - - linearis. 



Occipital foveje nearer together; head strongly punctured. 



Length 1.5 mm. - confltiens. 



Ill Pronotum with a small, elongate, median puncture. 



Occipital foveie near together, head strongly punctured. Length 



1.3 mm. - californicus. 



Occipital fove;E three times farther apart than either from the 



eye; head impunctate. Length 1.6 mm. - longissimus. 



Occipital foveae very near together. Length 0.95 mm. - perietiuis. 



