58 Memoirs on the Coleoptera 



dilated and the claws not very small. In surveying the nine species 

 which I have assigned to the genus, there are of course some 

 modifications of these characters, which will be noted; the mandi- 

 bles in obtusus, for instance, are smaller, more decussate and with 

 obtuse outline when closed, and the abdomen is flat at base. The 

 beak is usually rather short, evidently arcuate and sometimes 

 moderately thick; the body is generally wholly glabrous, but in 

 setulosus has sparse erect pale setae throughout. 

 The species may be described as follows : 



Upper surface glabrous 2 



Upper surface sparsely setulose 9 



2 — Elytral grooves coarse and deep; beak thick 3 



Elytral grooves narrower 8 



3 — Elytral grooves impunctate or virtually so 4 



Elytral grooves conspicuously punctate along the bottom 7 



4 — Body subquadrate-oval, the prothorax broader, the elytra abruptly obtuse 



behind when viewed antero-obliquely, the subapical prominences distinct. . .5 



Body more oval or subrhombiform, the prothorax relatively not so wide, the 



elytra behind not so abruptly subtruncate on the disk 6 



5 — Form oblong-suboval, highly polished, black, the legs piceous; pronotum and 

 head obscure piceo-rufous; beak moderately stout and strongly arcuate, 

 straighter and slightly less stout distally, about as long as the prothorax, 

 strongly and closely sculptured at the sides, finely, sparsely punctulate above; 

 prothorax more than a fourth wider than long, the sides just visibly con- 

 verging and very feebly arcuate, rapidly rounding in apical third to the abrupt 

 tubulation, which is three-sevenths as wide as the base; surface impunctate, 

 abruptly having some distinct punctures only along the lateral edges; basal 

 lobe small, narrowly truncate, smooth, the lateral impressions very diffuse 

 and feeble; scutellum quadrate, nearly flat, smooth; elytra a sixth longer 

 than wide, between a fifth and sixth wider than the prothorax, the lower edge 

 ogival, with narrowly blunt tip, the sides at some distance from the base very 

 feebly and obtusely prominent; grooves coarse, very deep and abrupt, the 

 intervals flat, smooth; entire under surface with small but distinct sparse 

 punctures, the mes-epimera coarsely, Very densely punctate, with narrow 

 smooth edges; legs densely punctured. Length 2.5 mm.; width 1.6 mm. 

 Brazil (Chapada — forest). November. Two specimens. . .abruptus n. sp. 

 Form and polished lustre nearly similar, the pronotum and head more blackish 

 piceous, the legs black and decidedly longer; beak thicker and shorter, four- 

 fifths as long as the prothorax, strongly arcuate, strongly and closely punc- 

 tate, finely, sparsely so above; antennae blackish and not rufous, more medial ; 

 transverse impression at base of beak similar, distinct but not sulciform; 

 prothorax fully a third wider than long, the sides from the base a little more 

 converging, feebly arcuate, less rapidly rounding anteriorly to the tubulation; 

 surface similarly very smooth, but with a somewhat wider area of deep sepa- 

 rated punctures at each side; basal lobe similar; scutellum much smaller, 

 rather minute, more deeply impressed along the middle, but subquadrate; 

 elytra only slightly longer than wide, more obtusely ogival, not a fifth wider 

 than the prothorax, the subapical prominences, humeri, grooves and intervals 

 nearly similar; metasternum equally sparsely but more coarsely, the mes- 

 epimera coarsely but more loosely, punctate; legs less densely so, the tibiae 

 longer, more slender and with much feebler external angulation near the base. 

 Length 2.35 mm.; width 1.5 mm. Brazil (Chapada). March. One ex- 

 ample subquadratus n. sp. 



