40 Memoirs on the Coleoptera 



as the prothorax, shining, cylindric, finely and rather sparsely punctate, 

 somewhat more closely and less finely at the sides basally, these but slightly 

 flattened; antennal club shorter, elongate-oval, only three-fourths as long as 

 the funicle; prothorax a little more distinctly wider than long, the converging 

 sides less evenly arcuate and feebly so, more strongly anteriorly; surface 

 even; basal lobe truncate, not impressed and not evidently punctate, trun- 

 cate, the lateral impressions very feeble; scutellum quadrate, slightly wider 

 than long, smooth, feebly convex, arcuate at apex; elytra nearly as in the 

 preceding but still narrower, similarly substriate, the extremely minute 

 punctures distinct very near the base; hind tibiae similarly obtusely angulate 

 externally but at a point nearer the base; abdominal plaque distinctly, 

 rather closely punctate, only feebly concave and somewhat irregular, with a 

 transverse ridge near the middle. Length 6.8 mm.; width 4.35 mm. Brazil 

 (Chapada) cylindrinasus n. sp. 



12 — Species larger, never less than about 7.5 mm. in length 13 



Species smaller, always less than 7 mm. in length 18 



13 — Pronotum more or less umbonate on the upper surface medially near each 

 side 14 



Pronotum not evidently umbonate near the sides, though sometimes rather more 

 convex in that neighborhood; body above never intensely black 17 



14 — The umbones rather more distinct as a rule, but often broadly rounded; 

 body larger in size. . 15 



The umbones obtuse, the body smaller in size, generally more distinctly bi- 

 colored 16 



15 — Form rather short and stout, very shining and smooth, deep black, the pro- 

 notum piceo-rufous; beak only two-thirds as long as the prothorax, com- 

 pressed, feebly arcuate, strongly and closely punctate, more finely above, 

 the channel beyond the antennae broad and deep; antennal club gradually 

 pointed, not quite as long as the funicle; prothorax barely a fifth wider than 

 long; sides from above very moderately converging and nearly straight to 

 the narrowly rounded angulations, the line joining the latter from a postero- 

 oblique viewpoint subsinuato-truncate; apical tubulation a third as wide as 

 the base, the basal lobe strongly punctate marginally, the apex feebly sinuate, 

 the lateral impressions wanting; scutellum quadrate, slightly longer than 

 wide, broadly arcuate at base, feebly convex and with sparse and extremely 

 minute punctulation; elytra only a fifth wider than the prothorax, triangu- 

 lar, not longer than wide, the humeri broadly rounded, the apex narrowly 

 rounded; striae very fine but evident and with the punctures distinct and 

 less distant than usual; angulation of the hind tibiae broad, near basal third, 

 being at an unusual distance from the base; abdominal plaque broadly con- 

 cave and very densely punctate, smooth at base. Length 8.8 mm.; width 

 6.4 mm. Brazil (Chapada). November. One specimen . . truncaticollis n. sp. 



Form less abbreviated, rhomboidal, shining, black and smooth, the prothorax 

 also black; beak still shorter, barely three-fifths as long as the prothorax, 

 very feebly arcuate, compressed, coarsely and densely sculptured, finely 

 punctulate above, the channels beyond the antennae broad and deep, gradu- 

 ally disappearing; antennal club decidedly shorter than the funicle; pro- 

 thorax longer, barely at all wider than long, the sides from above moderately 

 converging and nearly straight to the obvious though rounded umbones, 

 the line transversely joining which, from a postero-oblique viewpoint, is 

 broadly arcuate; basal lobe obtusely rounded, almost punctureless, the basal 

 impressions almost obsolete; scutellum quadrate, with some feeble punctu- 

 lation; elytra slightly elongate, a fourth wider than the prothorax, the much 

 narrowed apex rounded, the humeri very broadly rounded; striae very fine 

 and subobsolete, the punctures small, moderately to notably distant; ab- 



