Goleopterological Notices, V. 431 



California (Lake 4'ahoe). 



Described from the male, which has the sixth ventral broadly, 

 feebly sinuate throughout at apex, with the surface not modified, 

 the median segment of the seventh acutely parabolic, as long as 

 wide, polished, with a few erect setae; anterior tibiae not modified, 

 the tarsi distinctly dilated The female is almost perfectly similar 

 in general structure to the male, but has the head a little smaller 

 and the sides of the elytra a trifle more divergent. 



This is an interesting aberrant type of the genus, having longer 

 antennae, and differing also in male sexual characters and in tarsal 

 structure; the first four joints of the stout posterior tarsi are to- 

 gether much longer than the last, with the second joint nearly 

 twice as long as the first and as long as the next two together. 

 The subobsolete ocelli makes the transition to the complete absence 

 of them in Yellica, a comparatively easy one and also detracts 

 somewhat from the importance of that character. 



A. atriventre. — Subparallel, convex, shining, tlie pronotum but very 

 feebly reticulate and alutaceous, pale rufo-testaceous, the abdomen black ; 

 antennae darker at apex. Head fully three-fourths as wide as the prothorax, 

 fiat, minutely, sparsely punctate, very obsoletely biimpressed between the 

 eyes and between the antennae ; ocelli large, diffuse, separated by fully one- 

 third the width ; eyes large, prominent ; antennae scarcely as long as the head 

 and prothorax, moderately incrassate, the last five joints gradually larger. 

 Prothorax transverse, fully three-fourths wider than long ; sides broadly, 

 evenly arcuate, much more convergent in apical half, the base truncate and 

 nearly one-half wider than the apex ; basal angles obtnse but not appreciably 

 blunt ; disk strongly, transversely convex, even, minutely but distinctly, 

 sparsely punctate. Elytra distinctly longer than wide, more than twice as 

 long as the prothorax, and, near the apex, one-third wider ; sides feebly 

 divergent, nearly straight; humeri slightly exposed at base; apex broadly, 

 feebly arcuate, with a small notch at the suture ; punctures strong confused 

 and rather dense. Abdomen half exposed behind the elytra. Length 1.7 mm. ; 

 width 0.75 mm. 



California (Los Angeles). 



This species is allied to gilvipenne, resembing it in general form, 

 but differs in its shorter, more transverse prothorax, which is much 

 more narrowed toward apex, in its larger, more distant ocelli, and 

 in coloration and size. The single male has the sixth ventral thin 

 and transparent, broadly lobed in the middle, the surface before the 

 lobe abruptly elevated, flat, transversely trapezoidal, with the apex 

 of the thickened part not quite attaining the apex of the segment 



