496 Memoirs on the Coleoptera 



than the prothorax and one-half longer, the humeri very obtuse; grooves 

 moderate, with small and distant punctures at the bottom; intervals 

 twice as wide as the grooves, each with a single series of fine and widely 

 separated punctures; under surface closely but not very coarsely punc- 

 tate. Length (cf ) 2.4 mm.; width 1.2 mm. Brazil (Para), — Baker. 



The spine before each anterior coxa is erect, slender and straight, 

 and is one-half longer than the thickness of the anterior femora. 



Haplostethops n. gen. 

 The type of this proposed genus was described by me under the 

 name Idiostethus ellipsoideus, but, with the discovery of several 

 other allied forms, it becomes apparent that the discrepancies 

 between it and species of the tuhulatus type, are generic, rather 

 than merely specific. The body is of different outline, being sub- 

 evenly elongate-oval, the humeral callus much less evident, and, 

 beneath, the generally very small remote and inconspicuous squam- 

 ules, become dense white scales broadly toward the sides of the hind 

 body, almost exactly as in Limnobaris T-alhum and pusio; there is 

 no trace of this character in any of the rather numerous species 

 allied to tuhulatus and constituting the true Idiostethus. The 

 prosternum is not armed in the male and the ratfier deep sulcus of 

 Idiostethus is almost obsolete. Our six species, so far as discovered, 

 may be described as follows: 



Form moderately stout, but little more than twice as long as wide. ... 2 

 Form notably slender, much more than twice as long as wide in both 



sexes 4 



2 — Prothorax less abbreviated, with clearly defined punctures, except at 

 the sides. Body oval, somewhat convex, deep black throughout, 

 moderately shining, the minute remote squamules above scarcely 

 discoverable, closer and more distinct beneath and dense at the 

 sides of the hind body; beak in the female long, not quite half as 

 long as the body, cylindric, evenly and strongly arcuate and dis- 

 tinctly sculptured, the antennae at the middle; prothorax fully one- 

 half wider than long, .the sides converging and feebly arcuate, a 

 little more so toward the tubulate apex, which is more than half as 

 wide as the base; punctures rather strong and close, especially in a 

 longitudinal direction; smooth median line biabbreviated; scutellum 

 small, nude, emarginate behind; elytra one-half longer than wide, 

 an even ogive in outline from base to the narrow apex, slightly 

 wider than the prothorax and two and one-half times as long, the 

 humeral prominences feeble; striae rather coarse, with small distant 

 punctures at the bottom; intervals twice as wide as the grooves, 

 with very fine and loosely confused punctures; under surface rather 



