172 CALIFORNIA ACADEMY OF SCIENCES. 



ible short set i from each puncture. Head rather small, constricted behind 

 the eyes; front feebly cunvex, finely and rather densely panctate, ii.ore 

 closely so near the eyes, and 'nuch more sparsely and finely so near the 

 apex and on the labrum; the latter very deeply and rather narrowly sinuate 

 at apex; eyes moderate, slightly prominent, much shorter than wide, verti- 

 cally oval; antennae slender, as long as the pronotam, first joint as long as 

 the next two together, second much longer than the third, last four joints 

 forming a rather narrow, elongate, perfoliate club, the last three joints of 

 which are rendered opaque by an excessively fine and dense pubescence, 

 eleventh slightly long r than wide, flattened, evenly and broadly roundel at 

 tip. Prothorax widest at the base, where it is generally slightly more than 

 one-half wider than long; sides strongly convergent thence to the apex, 

 broadly, evenly and distinctly arcua'e; apex broadly and feebly incurvate, 

 one-half as wide as the base; the latter broadly truncate in the middle and 

 thence slightly oblique and very feebly sinuate to the basal angles; the 

 latter slightly obtuse, narrowly rounded; disk broadly and rather feebly 

 convex, more strongly so in the middle anteriorly, narrowly and obso- 

 letely impressed along the middle, and more broadly and obliquely near 

 eaah basal angle; sides narrowly and gradually subexplanate, narrowly 

 mirgined with an elevated b3rder; surface finely and very densely punc- 

 tate; punctures round, deep, sometimes with a few smaller ones intermin- 

 gled. Scutellum very densely punctite; pubescence longer and more 

 dense. Elytra at base about as wide as the prothorax; sides parallel and 

 nearly straight, rather abruptly and broadly rounded behind, slightly trun- 

 cate in the males; disk one-third longer than wide, more than twice as long 

 as the prothorax, transversely and moderately convex, narrowly and ab- 

 ruptly reflexed at the side^; each with three lougitadiual, feebly-elevated 

 costae, with numerous intermediate and subtransverse elevations; depressed 

 areas rather coarsely and liot very densely punctate, interspaces finely and 

 strongly granulose. Legs moderate in length, slender; first joint of the pos- 

 terior tarsi fully as long as the fifth, and as long as the next three together. 

 Length 11.0-13.0 mm. 



California; (San Francisco). 



The sexual characters are as follows: — 



Male — Last ventral segment transversely truncate at apex, 

 edge almost perfectly straight; anterior tarsi very feebly 

 dilated, middle not at all dilated, very slender. 



Female — Last ventral segment narrowly and strongly 

 rounded behind, immediate apex narrowly truncate or sub- 

 sinuate; tarsi all narrow and slender. 



This species resembles raniosa Say, but differs in its 



