408 Memoirs on the Coleoptera 



separated by a deep reentrant angle; prothorax much less convex — viewed 

 in profile, between a fourth and third wider than long, the sides parallel, 

 straight to subsinuate, rounding from a point slightly beyond the middle to 

 the strong tubulation, which is slightly more than half as wide as the base; 

 surface smooth, nearly as in the preceding; elytra suboblong and a fourth 

 longer than wide, the sides but feebly oblique and nearly straight, the apex 

 rapidly and very broadly obtuse, relatively wider and less rounded than in 

 the preceding, much wider than the prothorax but not quite twice as long; 

 grooves almost similar but a little deeper, very fine at apex, not coarsely 

 impressed as in the preceding, and barely at all more distinct; abdomen 

 nearly similar, the legs longer. Length 2.6 mm.; width 1.2 mm. Brazil 

 (Santarem). A single male example pertinax n. sp. 



5 — Body much more slender than in any of the preceding, shining, piceous, the 

 elytra faintly more rufous; beak (cf) moderately slender, evenly cylindric 

 and arcuate, as long as the prothorax, more closely, rugosely sculptured and 

 separated by a very feeble impression; prothorax very nearly as long as 

 wide, feebly and evenly convex in profile, the sides just visibly converging 

 and subsinuate, rapidly rounding well beyond the middle to the strong 

 tubulation, which is four-sevenths as wide as the base, the punctures rather 

 small but strong and distinct, sparse; elytra nearly a third longer than wide, 

 with slightly oblique, nearly straight sides and broadly rounded apex, fully 

 a fourth wider than the prothorax and twice as long, the very fine grooves 

 coarse basally and at apex; abdomen finely, sparsely punctate, the sterna 

 of the hind body more closely than in the preceding section, but not densely 

 cribrate as in some of the succeeding species. Length 2.6 mm.; width 1.15 

 mm. Brazil (Chapada — forest). October. One specimen — probably like 

 the others found in flowers furtivus n. sp. 



6 — Body narrowly subrhombic-oval, black and shining throughout, the elytra 

 with very faint piceous tinge; beak (9) moderately thick, unusually short 

 and strongly arcuate, especially toward base, scarcely as long as the head 

 and prothorax, feebly tapering, rather strongly and closely punctate at the 

 sides, separated by a very shallow reentrant; prothorax about one-half 

 wider than long, the sides distinctly converging and broadly, evenly arcuate 

 from base to the very brief tubulation, which is rather more than half as 

 wide as the base; punctures sparse and very small, but more distinct than 

 in the first three species, though less conspicuous than in furtivus; elytra a 

 third longer than wide, with rather prominent humeri and distinctly oblique 

 and feebly arcuate sides, the apex rapidly somewhat obtusely rounded, 

 about two-thirds as broad as the width at the humeri, distinctly wider than 

 the prothorax and evidently more than twice as long; abdomen and sterna 

 about as in the first three species. Length 2.25 mm.; width 1.05 mm. 

 Brazil (Chapada). November. One specimen, apparently female. 



nigrinus n. sp. 



Body stouter and with rather larger prothorax, polished black, the elytra feebly 

 picescent, the legs black; beak not distinctly separated from the head in 

 either sex, very short, stout, feebly arcuate, finely, sparsely punctulate and 

 much shorter than the prothorax (d 71 ), or a little less thick, straighter, bent 

 at base, minutely, sparsely punctate, barely at all tapering and as long as 

 the prothorax ( 9 ), and much thicker than in the female type of nigrinus; 

 prothorax a third wider than long to slightly more, the sides slightly con- 

 verging and nearly straight, broadly rounding and oblique beyond the middle 

 to the very short and feebly defined tubulation, which is slightly more than 

 half as wide as the base; surface moderately convex, the remote infinitesimal 

 punctulation scarcely discoverable; elytra a fourth — or slightly more — 

 longer than wide, with distinctly oblique, broadly and subevenly arcuate 



