236 CALIFORNIA ACADEMY OF SCIENCES. [80] 



very minutely, feebly and transversely reticulata. Legs moderate in length; 

 anterior tarsi feebly dilated. Length 3.5-LO mm. 



California; (San Francisco 2; Lake Co. 2.) Mr. Fuchs. 



The pronotum has a very small impressed fovea in the 

 middle at the base which is sometimes absent and some- 

 times replaced by a larger and more irregular impression 

 which, however, is not transverse as in fioribundum. 



This species resembles fioribundum Lee. in several char- 

 acters, especially in the punctate head and coloration of the 

 bod} r , but differs remarkably in the antennae, which are of a 

 pale and pure flavate throughout in the former; the anten- 

 nae are piceous in fioribundum except the three basal joints, 

 which are paler. 



In all the species of Amphichroum here described, there 

 are visible on the first, or sometimes the second, exposed dor- 

 sal segment of the abdomen two small, approximate patches 

 of a more or less transversely oval shape, on which the pu- 

 bescence is excessively short and dense and usually of a 

 pale cinereous or bright fulvous color; they are also to be 

 seen in a similar position, but oblique in direction, on the 

 abdomen of Homalium algarum Cas. These pubescent and 

 very minutely rugulose areas, which are probably sensitive, 

 are not sexual, and appear to characterize a large portion of 

 the Homalini. 



A. alutaceum u- sp. — Form rather slender, depressed; head and abdomen 

 black; pronotum, elytra, palpi and antennas toward tip rather pale castane- 

 ous; basal margin and sides of the pronotum very narrowly pale flavate; 

 antennae same toward base; elytral suture dark rufo-testaceous; legs dark 

 brownish-testaceous; pronotum and elytra rather densely pubescent; head 

 and abdomen very sparsely so; integuments shining. Head longer than 

 wide; surface depressed, impunctate, coarsely granulose, shining, broadly 

 and distinctly impressed between the antennas, obliquely, very finely and 

 feebly bistriate between the eyes; ocelli small, approximate, distinct; 

 antennas scarcely two-fifths as long as the body, slender, slightly incrassate; 

 basal joint very slightly longer than the second; joints two to ten nearly eqn; 1 

 in length, the latter one-half longer than wide, eleventh longer, obliquely 

 pointed at tip, cylindrical at base. Prothorax widest in the middle, where it 

 is scarcely one-fourth wider than long; sides nearly parallel, feebly arcuate 



