CALIFORNIA ACADEMY OF SCIENCES. 295 



than the head and prouotum together, first two joints equal in length, third 

 distinctly shorter, joiuts five to ten equal in length and slightly shorter than 

 the fourth which is scarcely twice as long as wide, tenth very slightly wider 

 than long, eleventh very slightly longer than the two preceding together, 

 obtusely acuminate at tip. Prothorax widest at two-fifths its length from 

 the apex where it is distinctly na rower than the head and very distinctly 

 narrower than long; sides strougly convergent anteriorly and feebly sinuate 

 near the apex, feebly but distinctly convergent posteriorly, and straight; base 

 broadly and evenly arcuate and but very slightly more than twice as wide as 

 the apex; disk moderately convex, extremely minutely and rather sparsely 

 punctate. Elytra at base one-half wider than the pronotum; sides as in 

 eximla; apex very feebly iucurvate, trisinnate; disk very slightly longer than 

 wide, much longer than the pronotum, very feebly impressed on the suture 

 near the scutellum, moderately convex, very finely and rather sparsely punc- 

 tate, more coarsely and closely so toward the suture and base. Abdomen at 

 base nearly two-thirds as wide as the elytra and nearly three-fourths as wide 

 as at the apex of the fourth segment, finely puuctate posteriorly; underside 

 minutely and very sparsely puuctate. Legs very slender; first joint of the 

 posterior tarsi distinctly longer than the next two together, the latter short 

 and equal in length, much shorter than the fourth, fifth very slightly shorter 

 than the first. Length 2.6 mm. 



California (Gualala River, Mendocino Co., 1). 



This species is the smallest thus far observed; it is prob- 

 ably described from a female, the sixth segment being very 

 obtusely and broadly rounded at the apex with the sides 

 widely divergent and feebly arcuate; the outline is nearly 

 parabolic in shape. It may be distinguished from the 

 others by its small size, very minute and comparatively 

 sparse pronotal punctuation, and by the form of the abdo- 

 men which is less strongly narrowed toward base than in any 

 other here described except grcuidicottis. 



C. grandicollis n.sp. — Form rather robust; body black throughout, legs 

 dark reddis'i-testaceous, tarsi scarcely paler; antennas and under surface 

 piceous-black, integuments shining; pubescence bright fulvo-cinereous, 

 fine, very dense and conspicuous. Head about as wide as long, transversely 

 truncate posteriorly; basal angles rounded; sides parallel and feebly arcuate; 

 eyes small, not prominent; occiput moderately convex, very finely and 

 densely punctate; antenure as long as the head and prothorax together, slen- 

 der, basal joints; slender, equal in length and very slightly longer than the 

 third, joints four to ten decreasing very slightly in length, the latter about 

 as wide as long, eleventh scarcely as long as the two preceding together. 



