432 Coleopterological Notices, V. 



and broadly sinuate in the middle, not truncate as in gilvipenne ; 

 anterior tibiae simple. 



A. f raterniim. — Broad, cuneiform, convex, pale rufo- testaceous through- 

 out, alutaceous, the elytra polished. Head three-fourths as wide as the pro- 

 thorax, the surface perfectly flat, minutely, sparsely punctulate ; eyes large ; 

 ocelli large, separated by one-third the width, each immediately beliind a 

 small deep impressed fovea ; antennje as long as the head and prothorax, 

 gradually and rather strongly incrassate from the middle. Prothorax trans- 

 verse, not quite twice as wide as long ; sides feebly rounded, slightly conver- 

 gent in basal and strongly so in apical half; apical angles obtuse but visible; 

 base two-fifths wider than the transversely truncate apex ; disk evenly con- 

 vex, broadly, feebly impressed at the sides behind the middle, very widely so 

 toward base ; punctures very minute but rather close. Eljtra large, longer 

 than wide, transversely convex, one-half wider than the prothorax and nearly 

 three times as long, semi-circularly rounded behind, covering all but the acute 

 tip of the abdomen, finely but strongly, distinctly confusedly and not very 

 densely punctate. Length 2.2-2.6 mm. ; width 1.1-1.25 mm. 



California (Hoopa Valley, Humboldt Co.). 



The male, from which the above outline is drawn, has the tibiae 

 simple and straight, the posterior tarsi long, stout, with the second 

 joint notably longer than the first and almost as long as the next 

 two — nearly as in subanguJatum — the first four together much 

 longer than the fifth, the fifth ventral broad, transverse at apex, 

 with a deep abrupt parallel-sided median fissure nearly four times 

 as deep as wide, the sixth short, broadly sinuate throughout, and 

 the median ligula of the seventh large, longer than wide, convex 

 and acutely triangular. The female is similar but larger, the elytra 

 more oval, more than three times as long as the prothorax, covering 

 the entire abdomen, slightly dehiscent at apex, and arcuately nar- 

 rowed and conjointly acutely ogival from posterior third. 



This species with the eastern convexum and the Californian 

 auTifiuum of Fauvel, constitutes a peculiar group of the genus, 

 differing in the nature of the male sexual characters, in the larger 

 oval and more convex elytra, and in tarsal structure. 



Aiirifiuum, of which I took a large series at Lake Tahoe, is 

 a small species, 1.5-2.0 mm. in length, having the anterior and 

 middle tibias flattened within and strongly arcuate throughout the 

 length, the posterior tarsi shorter and more nearly normal, the fifth 

 ventral unmodified and the sixth longer, narrower, trapezoidal, 

 with the apex narrowly truncate. In the female the elytra pro- 



