AMERICAN COMPONENTS OF THE TENTYRIIN^ 413 



anterior and intermediate with small and less conspicuous tufts 

 of coarse dense pubescence, the posterior without trace of liner 

 hairs and with the first joint notably longer than the fourth in 

 many cases. The mandibles are both squarely truncate at tip 

 and hollowed internally at apex, the menlum strongly transverse 

 and coarsely sculptured and the scutellum well developed ; the 

 upper margin of the epipleurte attains the sutural angle, not there 

 more retired than the lower margin as in the preceding genus, 

 but posterior to it, with the intervening surface similarly deeply 

 concave ; the upper marginal line is not a smooth carina but is 

 punctured along its crest, sometimes coarsely, and, very near 

 the sutural angle, rapidly descends toward the lower margin. 

 The female is generally a little stouter than the male. The 

 species are not so numerous as those of the two preceding gen- 

 era, those before me being separable as follows : — 



Abdomen coarsely, closely punctured and shining medially 2 



Abdomen finely, densely punctate and more or less opaque medially.. 4 



2 — Cephalic grooves extending to the frontal margin. Body stout, 



oval, sti"ongly convex, polished, black with a slight piceous tinge 

 above ; head coarsely, irregularly and not very closely to sparsely 

 punctured ; prothorax transverse, one-half wider than long, trape- 

 zoidal, with the sides nearly straight from above, broadly arcuate 

 viewed sublaterally ; apex four-fifths as wide as the base, unmar- 

 gined and truncate but becoming feebly sinuate and margined later- 

 ally, with the angles slightly obtuse but not rounded, the basal 

 angles acute but not everted, the surface moderately convex, even, 

 obsoletely and broadly impressed near the base, with rather coarse, 

 sparse and impressed punctures, closer anteriorly, becoming very 

 coarse but well separated laterally and again less coarse and very 

 close on the shallow subvertical flanks near the finely reflexed 

 side margins ; scutellum much wnder than long, large, broadly 

 angulate behind ; elytra broadly arcuate at the sides to the obtuse 

 but only slightly blunt humeri, which are very narrowly exposed 

 at base, slightly widest behind the middle, the apex gradually, 

 acutelv ogival, the surface feebly impressed alo"ng the suture pos- 

 teriorly, with very sparse punctures, generally small but varying 

 in size suturally, becoming coarse but still sparse laterallv, con- 

 fused throughout ; abdomen densely, rugosely punctured. Length 

 II. o mm.; width 5.22 mm. (Q). Nevada (Reno). 



bifossiceps n. sp. 



Cephalic grooves not extending to the frontal margin 3 



3 — Form stout, convex, polished, blackish-piceous thoughout, the 



short recumbent hairs of the anterior parts more noticeable than 



