1 66 Memoirs on the Coleoptera 



subequal to the next three ; prothorax a third wider than long, the converging 

 sides feebly arcuate, rounding beyond the middle to the constriction, which 

 is much smoother and less punctate than in the two preceding, except laterad ; 

 the tubulation is not quite half as wide as the base; surface impunctate; 

 basal lobe as in the preceding, with a few small punctures, the apex sinuato- 

 truncate; scutellum wider than long, more convex, strongly obtrapezoidal; 

 elytra parabolic, less than a fourth longer than wide, fully a third wider 

 than the prothorax and almost twice as long; humeri rapidly rounding to 

 the base; grooves coarse, very deep and nearly smooth; intervals twice as 

 wide as the grooves, with distinct but extremely remote punctures in single 

 line and bearing the remote and suberect white squamules, a few of which 

 are closer near the scutellum; under surface and legs with small and sparse, 

 slender white squamules; abdomen scarcely more than flattened medio- 

 basally in the male. Length 5.0-5.8 mm.; width 3.0-3.5 mm. Brazil 



(Rio de Janeiro). October. Two specimens nasutus n. sp. 



5 — Body elongate, rhomboidal, smooth and polished throughout and black, the 

 elytra obscure rufous; beak moderately slender and evenly arcuate, sub- 

 equal in the sexes and not quite half as long as the body, convex at the sides, 

 but having two very coarse and obscurely punctured grooves, separated by 

 a smooth intermediate surface, the part beyond the antennae rather closely, 

 evenly punctate, the upper surface finely, sparsely so; antennae slightly (9) 

 or much (6 71 ) beyond the middle, slender, piceous, the first funicular joint 

 nearly as long as the next three; prothorax a third (d") or two-fifths (9) 

 wider than long, the sides converging and broadly, subevenly arcuate from 

 base to the punctured constriction, the tubulation less punctured medially 

 and three-sevenths as wide as the base; surface minutely, feebly and re- 

 motely punctulate; basal lobe a little larger than in the preceding three 

 species but exactly similar in form, abrupt and with its apex sinuato-trun- 

 cate; scutellum rather wider than long, sinuate at apex, minutely punctulate 

 and strongly obtrapezoidal; elytra a third (o 71 ) or a fourth (9) longer than 

 wide, triangular, with arcuate sides and somewhat rapidly obtuse apex, 

 almost a third wider than the prothorax and distinctly more than twice as 

 long, the humeri evenly rounding to the base; grooves coarse, deep and 

 abrupt, nearly smooth; intervals not quite flat, twice as wide as the grooves 

 and with very minute sparse punctulation; under surface with coarse, 

 sparse punctures; abdomen (cf) with a large and abrupt, oval, punctulate 

 and setulose cavity through the middle of the first two segments, the pro- 

 sternal spines very short, erect. Length 4.7-6.3 mm.; width 2.5-3.6 mm. 

 Brazil (Chapada — campo). November. Five specimens.. piceipennis n. sp. 



The mandibles in this genus are arcuate and very deeply bifid, 

 but only moderately decussate, so that they are prominent when 

 closed. There is more than the usual intraspecific variation in the 

 size of the body in piceipennis. 



Crostis n. gen. 



The body in this genus is small and glabrous, the beak rather short 

 and thick, cylindric and very feebly, remotely punctulate, with 

 strongly decussate mandibles, and it is separated from the small 

 globular head by a deep angulate impression. The antennae are 

 evidently beyond the middle of the beak, the first funicular joint as 

 long as the next three or four, the others short, compactly joined and 



