12 CALIFOIIXIA ACADEMY OF SCIENX'ES. 



8— C. tantillum u- sp. — Very slender; head black; abdomen pieeous-black; 

 IDronotum and elytra castaueons, the latter slightly jmler at tip; legs rather 

 pale brownish, tarsi palei", brownish-llavate; antennas uniformly dark rufo- 

 fuscous 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, Avith a rather wide 

 median impunctate area; antenn;e 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 fr.urth, 

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

 scarcely perce2)tibly wider than the head; sides just visibly convergent from 

 apex 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, feeblj', evenly and 

 rather sparselj^ punctate, Avith a narrow but entire and rather wed-marked 

 median impunctate line; punctures very feeblj' 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 ve.iyfeeblj' arcuate; 

 together broadl3^ sub-angularlj' 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. Ahdontoi very 

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

 ately convex, very minutely, sub-asperatel}^ 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 tifth; second distinctly shorter than the third 

 and fourth combined. Length 2.8 mm. 



Santa Clara, Co., 4. 



DoscribeJ from the male in which the sixth segment is 

 sinnate at tip, the sinus being moderately broadly rounded 

 and between three and four times as wide as deep. 



This s])ecies 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 tlie more 

 sparse and minute pronotal ])unctuation, 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 sjiocies constituting the s(de repi'ese)ita- 

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



