BARIN.E 457 



long, nearly straight, feebly diverging and connate at base. The 

 basal thoracic lobe is abruptly formed and sinuato-truncate at apex, 

 the scutellum small, nude and quadrate. 



This genus, presenting a remarkable combination of characters, 

 may be placed near Centrinites for the present; the type is the 

 following: 



Acentrinops brevicollis n. sp. — Evenly oval, rather convex and shining, 

 deep black, the legs feebly picescent; squamules above long, slender, 

 white, everywhere well separated but conspicuous in single or irregularly 

 double series on the elytra and abruptly in lateral fifth of the pronotum, 

 the remainder of the latter glabrous, the squamules beneath are still 

 smaller, very slender and white, evenly and sparsely distributed through- 

 out; beak in the male slender, cylindric, shining, loosely sculptured, 

 feebly, evenly arcuate and a little longer than the head and prothorax, 

 the antennae at the middle; prothorax three-fifths wider than long, the 

 sides strongly and evenly converging and evenly, feebly arcuate from 

 base to the distinct apical tubulation, which is much less than half as 

 wide as the base; punctures minute and sparse, rapidly coarser and 

 rugulose toward the sides, the smooth median line distinct and entire; 

 elytra oval, with evenly arcuate sides and rather narrowly rounded apex, 

 three-sevenths longer than wide, at the moderately prominent humeri a 

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

 moderate; intervals between three and four times as wide as the striae, 

 loosely, moderately and confusedly punctured; male with the abdomen 

 distinctly impressed medially at base. Length (cf) 2.75 mm.; width 

 1.35 mm. Texas (Alpine), — Wickham. 



The white vestiture of the prosternum medially throughout its 

 length, is denser and more conspicuous than elsewhere on the under 

 surface. 



Nicentrites n. gen. 



The general organization of this proposed genus is nearly as in 

 Nicentrus, but the mandibles are entirely different and of very 

 peculiar structure; they are sharply angulate within, and their 

 outer contour is sinuate, so that the acute apex of each is everted. 

 The only other character to which attention should be called, is the 

 dense and very uniform vestiture throughout. The example at 

 hand which I have identified as Nicentrus testaceipes Chmp., also 

 belonging to this genus, came from near Guatemala City, and is 

 ovulate, with subinflated elytra and rather small prothorax, in 

 fact exactly like the figure given on the plate in the "Biologia"; 

 the following, which may be assumed as the type of Nicentrites, is at 



