90 Memoirs on the Coleoptera 



the upper surface cariniform basally; eyes separated by barely a third the 

 width of the beak, with nearly flat, punctate and unimpressed interspace, 

 the head finely punctate; prothorax only about one-half wider than long, 

 very convex and conical, the sides evenly and very feebly arcuate from base 

 to the extreme apex, which, as usual, is about three-sevenths as wide as the 

 base and rectilinearly truncate; surface minutely, remotely punctulate, not 

 quite so remotely, but barely visibly less minutely, toward the sides; basal 

 lobe very moderate, broadly rounded; scutellum minute, wider than long, 

 obtrapezoidal, with angulate apex; elytra barely at all longer than wide, 

 less than twice as long as the prothorax, parabolic; grooves very deep and 

 abrupt, punctulate along the bottom; intervals flat, with very minute and 

 sparse punctulation; under surface strongly punctate, the convex abdomen 

 very finely and sparsely. Length 2.2 mm.; width 1.3 mm. Brazil (Santa- 



rem). One specimen punctulatus n. sp. 



Prothorax relatively smaller, distinctly narrower than the elytra 11 



11 — Form oval, very faintly rhombic, deep black and polished, the tarsi and 

 antennae piceo-testaceous; beak feebly arcuate, longer than the head and pro- 

 thorax, strongly punctate, less so above, the carina wanting; eyes separated 

 by less than half the width of the beak, the interspace shining, impressed 

 and smooth posteriad; head sparsely punctate; prothorax about one-half 

 wider than long, the sides strongly converging and very feebly arcuate from 

 base to apex; surface feebly impressed along the apex, very minutely, feebly 

 and remotely punctulate, scarcely at all more distinctly laterad; basal lobe 

 moderate, rounded; scutellum minute, slightly wider than long, very ob- 

 tusely ogival, flat and smooth; elytra slightly longer than wide, somewhat 

 over twice as long as the prothorax and a fifth wider, very obtusely parabolic, 

 the humeri broadly rounded; grooves coarse, abrupt, finely punctate along 

 the bottom, the intervals flat, smooth, rather narrow, the second a little 

 more than twice as wide as the second stria; hind femora obliquely im- 

 pressed and more densely punctate basally, the tibia flat, triangular, with a 

 few fine raised threads, scarcely more than three times as long as wide. 

 Length 2.2 mm.; width 1.3 mm. Brazil (Santarem). One specimen. 



sparsus n. sp. 

 Form similar but narrower, still smaller, similar in coloration throughout; beak 

 almost similar, much longer than the head and prothorax; eyes separated by 

 barely a third of the rostral width, the shining interspace slightly impressed 

 but not foveate; head minutely, remotely punctulate; prothorax less than 

 one-half wider than long, the strongly converging sides from base to apex 

 evenly and barely visibly arcuate; surface finely though strongly, sparsely 

 punctate, somewhat more strongly toward the sides, and having a biabbre- 

 viated, smooth and feebly defined impunctate median line; basal lobe very 

 moderate, rounded; scutellum notably small, as long as wide, cordiform; 

 elytra slightly longer than wide, a sixth wider than the prothorax and less 

 than twice as long, with barely at all prominent humeri, more rapidly and 

 arcuately parabolic and much more narrowly rounded at apex than in 

 sparsus; grooves not quite so coarse, very deep, abrupt and with their 

 edges remotely and finely serrulate; intervals flat, with fine but evident 

 punctulation, usually in single line; hind femora evenly convex, arcuate 

 above, nearly straight beneath as usual, loosely punctate, the tibia more 

 slender than in sparsus and less flattened. Length 1.85 mm.; width 1.15 

 mm. Brazil (Santarem). One example conicicollis n. sp. 



The beak is sometimes very conspicuously dilated at apex in 

 certain individuals, and much less so in others, as in rivularis; as 

 it seems to be somewhat longer in the less dilated forms, I assume 



