338 Memoirs on the Coleoptera 



Beak dissimilar in the sexes, shorter and very slender, except at base, and with 

 the antennae post-median in the female, the thoracic lobe more evident and 

 medially sinuate at tip; male presternum not armed; body evidently more 

 depressed 5 



2 — Prosternal spines arising about midway between the coxae and apex; thoracic 

 lobe feeble though evident 3 



Prosternal spines longer and just before the coxae; thoracic lobe subobsolete, 

 barely at all traceable 4 



3 — Body oval, moderately convex, shining and deep black, the legs piceous; 

 beak (o 71 ) somewhat thick, cylindric, fully as long as the prothorax, very 

 moderately arcuate, shining and with rather close and moderate punctures, 

 in part serial; antennae medial, rufo-piceous; prothorax subinflated, a fifth 

 wider than long, the subparallel sides feebly arcuate, gradually rounding 

 beyond the middle to the rather distinct tubulation, which is somewhat less 

 than half as wide as the base; punctures coarse, deep, dense and longitudi- 

 nally subconfluent at the sides, gradually isolated and well separated in- 

 wardly, the distinct smooth median line not attaining base or apex; scutellum 

 as long as wide, obtrapezoidal; elytra obtusely oval, a fourth longer than 

 wide, only very little wider than the prothorax and three-fifths longer; 

 grooves coarse, punctured along the bottom, more coarsely laterad; intervals 

 moderate, narrow externally, with somewhat fine, rather close-set confused 

 punctures, in single lines on the narrower, the eighth and ninth slightly more 

 prominent; under surface moderately and somewhat closely punctate, the 

 male abdomen wholly unmodified, the prosternal spines short, not longer 

 than the femoral thickness. Length 2.85-3.0 mm.; width 1. 23-1 .3 mm. 

 Brazil (Santarem). Two male specimens glabra n. sp. 



Body more elongate and more parallel, rather less convex, shining and piceous, 

 the elytra brighter rufous; beak (cf) much shorter, three-fourths as long 

 as the prothorax; antennae a little longer, piceous; prothorax more nearly 

 as long as wide, the subparallel sides slightly arcuate, less and more gradually 

 rounded more anteriorly than in glabra, the tubulation half as wide as the 

 base; punctures coarse, deep and separated by their own diameter, gradually 

 a little coarser and dense laterally, the surface abruptly smooth in about 

 median fourth, this smooth area with minute, sparse punctures throughout; 

 scutellum smaller and narrower; elytra nearly a third longer than wide, 

 oval, the rounded sides feebly sinuate just before the rather obtuse apex, 

 slightly wider than the prothorax and only one-half longer; sculpture nearly 

 similar, except that the interstitial punctures are a little coarser and less 

 close-set; abdomen and presternum of the male nearly similar, the punctures 

 bearing rather more distinct slender squamules. Length 3.0 mm.; width 

 1.2 mm. Brazil (Chapada). May. On flowers. One male specimen. 



medialis n. sp. 



4 — Form oblong-suboval, a little narrower and more elongate in the male, very 

 moderately convex, shining, black throughout, the legs not paler; short and 

 rather slender; beak (d") moderately arcuate, cylindric, somewhat thick, 

 shining, finely, loosely punctate and distinctly shorter than the prothorax, 

 or ( 9 ) nearly similar but thinner, feebly tapering and almost as long as the 

 head and prothorax; antennae piceous, submedial in both sexes; prothorax 

 (o 71 ) as long as wide, a little shorter ( 9 ), the sides broadly, feebly arcuate, 

 rather more parallel (cf ), gradually rounding in about apical half, the tubu- 

 lation distinct, somewhat less than half as wide as the base; punctures 

 coarse, slightly separated to very hear the sides, gradually smaller and sparser 

 inwardly, with a distinct narrow impunctate line; scutellum as long as wide, 

 obtrapezoidal; elytra oval, shorter and more obtuse in the female, a third 



