280 Memoirs on the Coleoptera 



tudinal squamules less close-set; elytra a fourth to nearly third longer than 

 wide, rapidly elliptic posteriorly, distinctly wider than the prothorax but 

 only a little more than twice as long; striae coarse, deep; intervals alternating 

 more in width, the confused squamules rather less conspicuous, the first 

 interval uniseriate as usual; male abdomen feebly modified, just visibly 

 impressed medio-basally but barely visibly less densely squamose; anterior 

 coxae separated by a fourth their width. Length 2.3-2.75 mm.; width 

 1.0-1.28 mm. Brazil (Santarem). Six specimens rostralis n. sp. 



This distinctly characterized genus would have taken its place 

 near Centrinaspis, in the preceding tribe, were it not for the inter- 

 nally modified straight mandibles; it is a clearly annectant form 

 between the two tribes. 



Eunicentrus n. gen. 



The few species of this genus are evidently allied to Nicentrus, 

 but have an even more nearly parallel and much more convex 

 form of body, and also sparser vestiture. The mandibles are 

 relatively shorter and broader, and are barely visibly irregular 

 within, being virtually straight, and they further differ from those 

 of Nicentrus in having their upper surface feebly, longitudinally 

 ridged submedially almost throughout, but more distinctly toward 

 base. The beak is moderately thick and sculptured, rather short, 

 the antennae evidently beyond the middle in both sexes, the first 

 funicular joint almost as long as the next three, the seventh some- 

 what abruptly dilated and nearly as wide as the club, which is 

 ovulate, with its basal segment about half the mass. The flat and 

 densely squamose prosternum has a small and feeble, transverse 

 apical fossa, and it separates the coxae by about a fourth of their 

 width. The prothorax is not at all tubulate at apex, the basal 

 lobe moderate, gradually formed and rounded, densely squamose 

 only toward its apex, the scutellum abruptly, very densely albido- 

 squamose and the elytra deeply grooved. The two species at hand 

 are as follows: 



Form elongate-suboval, strongly convex, black throughout, shining and with 

 whitish vestiture, the squamules very slender and sparse throughout the 

 pronotum, and shorter, broader and in single lines on the elytra, the scutellum 

 and most of the under surface very densely squamose; beak evenly and 

 moderately arcuate, somewhat slender, coarsely longitudinally sculptured at 

 the sides and as long as the prothorax (d 1 ), or not quite so sculptured, a 

 little less thick, somewhat more tapering and smoother distally and nearly 

 as long as the head and prothorax ( 9 ) ; antennae dark rufous, at four- 

 sevenths ( 9 ) or three-fifths (o 71 ); prothorax nearly as long as wide (d>), very 

 little wider (9), the sides nearly parallel, gradually more converging and 

 arcuate anteriorly, the truncate apex half as wide as the base (<?), more ( 9 ), 

 the punctures coarse and well separated, longitudinally confluent toward 

 the sides, the smooth median line evident centrally; elytra obtusely oval, a 

 third longer than wide, very little wider than the prothorax and distinctly 

 less than twice as long; grooves abrupt and deep, half as wide as the intervals, 



