354 Memoirs on the , Coleoptera 



strongly and evenly arcuate, much wider at the middle than at base; tubu- 

 lation distinctly less than half as wide as the base; punctures fine, shallow, 

 well separated and very evenly distributed throughout, but with a smooth 

 though equally opaque median line; elytra three-sevenths longer than wide, 

 the oblique sides very feebly arcuate, the apex subevenly rounded, not quite 

 as wide as the widest part of the prothorax and but little over one-half 

 longer; sculpture peculiar, the grooves moderate, shallow, with minute 

 rugulosity and minute distant punctures, half as wide as the intervals, 

 which are flat, with the same dense rugulosity as the grooves, except along 

 the narrow smooth shining edges, and having, along the middle, a single 

 series of fine and well separated punctures; pygidium very short and trans- 

 verse, continuous in convexity with the abdomen; male abdomen very feebly 

 impressed along the median line basally, the first suture wholly obsolete 

 medially; prosternal spines slender, arcuate and diverging, one-half longer 

 than the femoral thickness in the type. Length 2.8 mm.; width 1.15 mm. 



Brazil (Chapada). November. One specimen roticollis n. sp. 



Body almost similarly cuneiform and convex, rather less opaque, black, the legs 

 and elytra rufous; yellowish squamules above minute and remote, but large, 

 though sparse, at the sides of the pronotum and few in number at base of 

 the discal strial intervals;, beneath they are large toward the sides of the 

 meso- and metasternum; beak (<?) nearly similar but much shorter, only 

 as long as the prothorax, the mandibles similar, the antennae medial, very 

 different in structure, shorter, the first funicular joint as long as the next 

 three, which are short and equal, the seventh transverse, the club as long as the 

 four or five preceding joints, oval, with its first segment fully half the mass; 

 prothorax somewhat longer than wide, inflated, the parallel sides strongly and 

 evenly arcuate, much wider at the middle than at base, the non-tubulate 

 apex half as wide as the base; punctures small and sparse, coarser at the 

 sides, the median line similar; scutellum very free, obtrapezoidal; elytra 

 similar in outline and relationship with the prothorax, but barely one-half 

 longer than the latter; grooves coarser toward base, the intervals nearly 

 similar, but not so densely opaque, the minute serial punctures scarcely 

 evident; male characters almost similar, the prosternal spines a little longer 

 and straighter; pygidium very short and transverse. Length 2.3-2.6 mm.; 

 width 0.9-1.0 mm. Brazil (Chapada). October. Two specimens. 



rufipennis n. sp. 



As will be seen in comparing these descriptions, there are two 

 distinct subgenera involved, having notably different antennal 

 structure, though almost entirely homologous otherwise. The 

 pygidium is much more evident in the female and vertical, though 

 small and transverse, and the female is larger than the male. The 

 opacity of the pronotum in both species is produced by a very 

 close-set system of extremely minute punctules, as in Camerones 

 and several other unrelated genera. 



* 

 Palistes n. gen. 



Here the body is quite different, being broadly oblong and 

 depressed, highly polished and wholly glabrous. The beak is 

 shorter, smooth, cylindric, nearly straight, feebly arcuate distally 

 and simply finely punctate, separated by a Very feeble impression, 



