12 CALIFORNIA ACADEMY OF SCIENCES. 



8— C. tantillum n- sp. — Very slender; head black; abdomen piceous-black; 

 pronotum and elj'^tra castaueons, the latter slightly paler at tip; leg^ rather 

 pale brownish, tarsi paler, brownish-flavate; antennae uniformly dark rufo- 

 fuscons throughout; pubescence of elytra and abdomen very fine, moderately 

 •sparse and not conspicuous. Head moderate, slightly longer than wide, sides 

 parallel and almost straight; base truncate, angles narrowly rounded; surface 

 moderately convex, rather coarsely and sparselj^ punctate, with a rather wide 

 median impunctate area; antennse slender, short, much shorter than the 

 head and prothorax together; basal joint as long as the next two together, 

 second slightly shorter and more robust than the third, as long as the fourth, 

 Outer joints very slightly wider, tenth as wide as long. Prothorax quadrate, 

 scarcelj^ perceptibly wider than the liead; sides just visibly convergent from 

 ajDex to base and nearly straight; base and apex broadly, equally and rather 

 strongly arcuate; apical angles rather broadly rounded, basal very broadly so; 

 disk transversely and moderately convex, very minutely, feebly, evenly and 

 rather sparsely punctate, with a narrow but entire and rather well-marked 

 median impunctate line; j)unctures very feebly impressed and separated by 

 about three times their own widths; surface feebly alutaceous. Elytra at base 

 very slightly wider than the pronotum; sides parallel and veiy feebly arcuate; 

 together broadly, sub-angularly and moderately sinuate at apex; disk nearly 

 one-third longer than wide, and nearly one-half longer than the pronotum, 

 narrowly impressed along the slightly elevated suture, rather finely, densely 

 and sub-asperately punctate; punctures smaller near the apex. Abdomen very 

 slightly narrowed toward base, nearly as wide as the elytra; surface moder- 

 ately convex, very minutely, sub-asperately, feebly and rather sparsely punc- 

 tate. Legs slender; first joint of the posterior tarsi as long as the next two 

 together, about as long as the fifth; second distinctly shorter than the third 

 and fourth combined. Length 2.8 mm. 



Santa Clara, Co., 4. 



Described from the male in wliicli tlie sixth segment is 

 sinuate at tip, the sinus being moderately broadly rounded 

 and between three and four times as wide as deep. 



This species is at once distinguishable from all the others 

 above described by the abdominal punctuation which is not 

 arranged in very well-defined wavy lines, by the more 

 sparse and minute pronotal punctuation, and by the rather 

 strong dilatation of the joints of the anterior tarsi in the 

 males. It is also the smallest species of the genus. 



OLIGOPTERUS n. gen. 



The very small species constituting the sole representa- 

 tive of this genus, is very singular and totally distinct in 



