276 Memoirs on the Coleoptera 



sides almost parallel in about basal half; apex narrowly rounded; grooves 

 coarse, abrupt and very deep, not distinctly punctured; intervals but little 

 wider than the grooves, each with a single series of rather close, strong 

 punctures; abdomen strongly convex, with distinct first suture. Length 

 3.0 mm.; width 1.28 mm. Brazil (Santarem). One example. 



obliquata n. sp. 



Elytra subevenly oval, gradually narrowed behind to the rather more obtuse and 

 rounded apex 2 



2 — Body very stout and convex, shining, blackish-piceous, the legs not paler; 

 sculpture and vestiture nearly as in the preceding, but the lateral pronotal 

 punctures are relatively coarser and not much united longitudinally, and 

 the rather dark fine pronotal squamules are very sparse and even less distinct, 

 these longer and whiter on the elytra, somewhat longer and more separated 

 than in obliquata, with the series becoming more confused suturally; beak 

 (<?) rather thick, evenly arcuate, strongly longitudinally sculptured and 

 four-fifths as long as the elytra, the rufous antennae well beyond the middle; 

 prothorax larger and more inflated, a fourth wider than long, the more 

 arcuate and less converging, but apically obliquely rounded sides incurvate 

 at base, in a way not traceable in the female of obliquata; punctures more 

 notably less coarse and sparser toward the median line; scutellum sparsely 

 squamulose; elytra slightly longer, barely visibly wider than the prothorax 

 and three-fifths longer; sculpture nearly similar; male abdomen with a 

 small and very feeble impression medially toward base, the straight prosternal 

 spines nearly a third as long as the prothorax in the types. Length 3.15-3.2 

 mm.; width 1. 4-1. 45 mm. Brazil (Santarem). Two males. 



subaequalis n. sp. 



Body less stout than in either of the preceding, the sculpture and vestiture 

 almost as in subcequalis, the pronotal punctures sparser than in obliquata and 

 much less confluent at the sides; beak (cf) shorter and less thick than in 

 subcequalis and three-fourths as long as the elytra, not quite so strongly, 

 though conspicuously and closely sculptured, distinctly more elongate, 

 slender and nearly smooth except at base ( 9 ), the antennae almost similar; 

 prothorax a fourth wider than long, somewhat more rounded at the sides in 

 the male; elytra throughout very nearly as in subcequalis; male abdomen 

 with even feebler basal impression, the prosternal spines in the only known 

 male very short, three-fourths as long as the femoral thickness. Length 

 2.65-2.75 mm.; width 1. 2-1. 25 mm. Brazil (Santarem). Three specimens. 



simulans n. sp. 



Although these species are undeniably closely allied, I think that 

 they are distinct as defined above. It sometimes happens that en- 

 tire genera, as well as species, are rather local in the Brazilian fauna. 

 The same is notable in regard to the nearctic genus Haplostethops. 



Pycnonicentrus n. gen. 



In this genus the body is decidedly oval, and rather densely and 

 uniformly clothed with narrow pale scales. The beak is thicker 

 and more strongly sculptured, and with the antennae beyond the 

 middle in the male, medial in the female; it is separated from the 

 head by a somewhat deep reentrant angle. The mandibles are 

 prominent and non-decussate, the straight inner edge with two 

 deep nicks and intermediate toothlet in the most accentuated 



