218 CALIFORNIA ACADEMY OF SCIENCES. 



nous on the head; iuteguments shiniug. Head distinctly longer than wide, 

 semicircularly rounded behind from points slightly behind the eyes; sides par- 

 allel and nearly straight; surface rather strongly convex, very minutely and 

 densely punctate; punctures much feebler and sparser along the middle; an- 

 tennae slightly shorter than the head and prothorax together; first joint but 

 very slightly longer than the second and third together, the latter subequal in 

 length, the second joint somewhat more robust, joints three to ten decreasing 

 rather rapidly in length, the former distinctly longer than wide, the latter 

 slightly wider than long. ProtJiorax distinctly narrower than the head, two- 

 fifths longer than wide, widest in the middle; sides in the anterior third rather 

 strongly convergent and very feebly sinuate to the nuchal emargination which 

 is narrow and deeply sinuate; sides in the posterior two-thirds rather feebly 

 convergent and broadly arcuate throughout; anterior angles extremely obtuse 

 and broadly rounded, almost obsolete; posterior broadly rounded; base ex- 

 tremely feebly arcuate; disk transversely and moderately convex, very mi- 

 nutely and not very densely punctate; punctures subassperate, evenly distrib- 

 uted; a narrow line along the middle impunctate; at the base there is a very 

 tine median carina. Elytra at base nearly one-third wider than the prothorax; 

 sides nearly parallel, feebly arcuate posteriorly; together broadly, angularly 

 and extremely feebly emarginate behind; disk feebly convex, slightly longer 

 than wide, distinctly longer than the pronotum, feebly impressed on the suture 

 toward base, rather coarsely and densely punctate toward the suture and 

 base, excessively minutely and slighth'^ more sparsely so exteriorly and api- 

 cally; suture finely margined with a narrow elevated border which is depress- 

 ed and much narrower at the scutellum. Abdomen at base slightly narrower 

 than the elytra; sides very feebly divergent and nearly straight to the apex of 

 the fourth segment; fifth as long as the two preceding together; surface 

 broadly and feebly convex, extremely minutely and densely punctate. Legs 

 finely punctate, rather short and robust; first joint of the posterior tarsi one- 

 third longer than the second, slightly shorter than the fifth. Length 3.3 mm. 



California; (Mt. Diablo, Contra Costa Co. 2). 



The specimens are both females;^ the sixth segment is 

 broadly angulate behind, the apex scarcely at all rounded, 

 the sides of the angle being broadly and very feebly arcuate. 

 The species is easily distinguished by its narrow head 

 semicircularly roanded behind. 



6. — In a male since obtained at Keno, Nevada, the fifth segment is 

 deeply and roundly emarginate at apex, the lateral angles being slightly pro- 

 duced; the surface has a deep oval impression, becoming extinct near the 

 base; the sixth segment is deeply sinuate at apex, the sinus fully twice as 

 wide as deep, with the edges slightly reflexed; the surface impressed. 



