CALIFORNIA ACADEMY OF SCIENCES. 303 



slightly arcuate; eyes large, very slightly prominent; occiput convex, front 

 flat, both very minutely and rather sparsely puncta'e; antennae very slender, 

 much longer than the head and pronotum together, two basal joints sub-equal 

 in length, the second slightly more slender, third distinctly shorter, joints 

 four to ten equal in length, the former nearly twice as long as wide, the 

 latter as wide as long, eleventh scarcely as long as the two preceding 

 together, acuminate at tip. Pro thorax widest at one-third its length 

 from the apei where it is only slightly wider than the head and distinctly 

 narrower than long; sides rounded and convergent to tLe apex, and very 

 feebly convergent and straight to the base, which is evenly and rather strongly 

 arcuate, distinctly narrower than the disk, and one-third wider than the 

 apex; the latter truncate; disk strongly convex, narrowly and rather feebly 

 impressed in the middle from the anterior third nearly to the base, finely, 

 «venly, densely and sub-asperate'y punctate. Elytra at base slightly wider 

 than the pronotum; sides just perceptibly divergent, feeblj r arcuate, together 

 broadly and feebly emarginate behind; apical angles very slightly produced; 

 disk rather feebly convex, very slightly longer than wide, about one-fourth 

 longer than the pronotum, very feebly impressed on the suture near the base, 

 finely, nearly evenly and sub-asperately punctate; punctures more spars9 than 

 those of the pronotum. Abdomen long and slender, at base scarcely »s wide 

 as the pronotum; sides very feebly divergent posteriorly, more strongly 

 arcuate near the tip; b rder narrow but rather deep; first three segments 

 very strongly and transversely impressed at base; impressed areas very 

 coarsely and densely punctate, elsewhere minutely and rather densely j unc- 

 tate; transvese bas d ridges very strong, straight, each having three short 

 posterior carinse. Legs very slender; tarsi slender, first joint of the posterior 

 as long as the next two together, much longer than the fifth. Length 2.6- 

 2.9 mm. 



California (Yountville, Napa Co., 1; San Jose, Sta. Clara 

 Co., 1). 



The specimens are apparently females; the sixth ventral 

 is broadly rounded at apex; the description is taken from 

 the first named specimen which is the larger; the second 

 differs slightly in the form of the prothorax, which is as 

 wide as long, and in which the sides are evenly sinuate 

 through the basal two-thirds; they resemble each other so 

 absolutely in all other characters, however, that there can 

 be very little doubt of their mutual identity. The species 

 is easily distinguished from the others by its very slender 

 form, and by the tricarinate basal ridges of the dorsal seg- 

 ments. 



