326 CALIFORNIA ACADEMY OF SCIENCES. 



structure of the pro thorax; it is apparently more abundant 

 than any other species. 



A. attenuatum i- sp. -Very slender; sub-cylindrical; intense black 

 throughout; autennie black; let;s darkcastaneous; suface moderately shining, 

 covered with minute granulations which are evenly disposed and somewhat 

 asperate; pubescence very fine and short, moderately dense, dull grayish in 

 color. Head scarcely more than one-half wider than long, rather convex, 

 defiexed; eyes moderate, prominent, coarsely granulate; epistoma very nar- 

 row at the apex which is acutely rounded; autennte two-fifths as long as the 

 body; joints of club increasing very rapidlj' in length and gradually in width, 

 eighth joint small, scarcely more than one-half a,; long as the seventh. Pro- 

 thorax but very slightly wider than the head and scarcelj'^ longer; sides par- 

 allel and feebly arcuate; base rather strongly arcuate, feebly sinuate toward 

 the basal angles; the latter viewed laterally broadly roitnded; disk strongly 

 and transver-ely convex, one-half wider than long, even throughout. Scu- 

 tellum triangular, very slightly longer than wide. Elytra at the humeri 

 slightly narrower than the pronotum; sides parallel and moderately arcuate 

 for three-fourths the length, 'together rather abruptly and obtusely rounded 

 behind; disk sub-cylindrically and strongly convex, four-fifths longer than 

 wide and two-thirds longer than the head and prothorax together, humeri 

 slightly prominent, rounded. Pygidiiim S-mi-circularly rounded beneath, 

 vertical, not attaining the elytral tip, feebly convex, grauuiose and more con- 

 spicuously fiubescent. Legs moderately stout; tarsi and coxas very slightly 

 jjaler. Length 0.45 mm. 



California (Santa Cruz, 1). 



A very minute species; it may be distinguished at once 

 from either of the others here described by its narrow form, 

 more quadrate prothorax and coarser sculpture. The sides 

 of the pronotum are longer in proportion to the median 

 length; the sculpture is as coarse as in granulosum and the 

 granulations are much more sparsely distributed than in 

 that species; in rohustulum these are much finer and less 

 conspicuous. 



The species here described are very homogeneous and be- 

 long apparently to the I'owlerianitm group of Mr. Matthews, 

 this being distinguished by the dull alutaceous surface 

 sculpture, elongate elytra, and fine dense pubescence. _ All 

 the specimens were taken in wet sand, on the surface of mud 

 between small stones, or in mouldy earth along the edges of 



