214 CALIFORNIA ACADEMY OF SCIENCES. 



piceous, anterior legs and tarsi throughout paler, piceous-brown; palpi pi- 

 ceous; antennas piceous, paler toward tip; pubescence extremely short, fine 

 and excessively dense on the elytra and abdomen, much less dense anteriorly. 

 Head small, as wide as long; sides behind the eyes very slightly divergent 

 posteriorly, feebly arcuate; base truncate; angles not prominent, rather 

 broadly rounded; front evenlj' and feebly convex, excessively minutely and 

 densely punctate; antennas rather long, slender, as long as the head and pro- 

 thorax together, not incrassate; basal joint scarcely as long as the next two 

 together, second three-fourths as long as the third, scarcely as long as, but 

 slightly more robust than the fourth, joints four to six equal, twice as long 

 as wide, six to ten decreasing in length, the latter scarcely as wide as long. 

 Frothorax widest in the middle, where it is distinctly wider than the head; 

 sides parallel, feebly arcuate; base and apex broadly arcuate, the latter very 

 feebly so; basal angles broadly rounded; apical more narrowly so; disk as 

 wide as long, feebly and evenly convex, excessively minutely, evenly and 

 densely punctato-granulose. Elytra at base just visibly wider than the prc- 

 thorax; sides nearly parallel, feebly arcuate: together brcadly and very feebly 

 emarginate behind; disk slightly longer than wide, nearly one-fourth longer 

 than the prothorax, feebly convex, not appreciably impressed along the 

 suture, excessively densely and very finely granulose, each granule bearing a 

 minute hair. ^6cZomen not narrowed toward base; sides parallel and straight 

 border narrow, erect; surface feebly, cylindrically convex, excessively mi- 

 nutely, feebly and densely punctate; punctures slightly asperate and not 

 arranged in any order. Le^/s rather short and robust; first joint of the pos- 

 terior tarsi fully as long as the fifth. Length 3.7 mm. 



Nevada; (Reno 1). 



The unique specimen is a male, the sin uation of the sixth 

 segment being about four times as wide as deep and acutely 

 rounded. 



The pronotum has besides the regular system of excess- 

 ively minute granulate punctures, a widely and irregularly 

 scattered system of larger, though still very small, rounded, 

 shallow punctures, each of which bears a small, erect seta. 

 The elytra are opaque, the head and prothorax somewhat 

 shining. 



LEPTOGENIUS n. gen. (Pffiderini.) 



Body slender, roughly sculptured. Head large, borne on a nairow neck. 

 Prothorax small. Elytra longer and wider than the pronotum. Abdomen as 

 wide as the elytra, gradually decreasing in width toward apex; four basal 

 segments equal in length; fifth nearly one-half longer than the fourth; sixth 



