232 Memoirs on the Coleoptera 



line; elytra triangular, fully a third longer than wide, fully a fourth wider than 

 the prothorax and much more than twice as long, the oblique sides broadly, 

 subevenly arcuate, the apex narrowly rounded; humeri small but distinctly 

 prominent; grooves about half as wide as the intervals, which are strongly, 

 densely, confusedly and somewhat asperately punctate; abdomen gradually 

 rather pointed, moderately convex and evenly, strongly and densely punctate. 

 Length 2.8-3.0 mm.; width 1. 35-1. 5 mm. Brazil (Chapada — forest). Novem- 

 ber. Two female examples. 



One of these female examples is notably broader than the type, 

 with less cuneiform elytra and somewhat broader strial intervals, but 

 they appear to be exactly similar otherwise. 



Microbaridia n. gen. 



The type of this proposed genus would have been placed as a 

 very small slender Centrinaspis, were it not for the mandibles, 

 which seem to be radically different, for, instead of being in close 

 contact along the entire extent of their straight inner edges, as in 

 that genus, the even inner edges are here arcuate and diverge 

 rapidly from base to apex, they being in contact when closed only 

 in about basal half, and the outer edge is broadly sinuate through- 

 out; the mandibles are also unusually narrow in form, the apex 

 of the beak above them broadly, evenly rounded. The antennae 

 are behind the middle and are nearly as in Centrinaspis, but the 

 outer joints of the funicle are rather rapidly broader, the club 

 moderate, oval and not abrupt. The presternum is flat and 

 densely squamose, as is also the free scutellum, and the anterior 

 coxae are moderately separated. The general structure is as in 

 Centrinaspis, and there are no ante-coxal spines in the male. The 

 type is as follows: 



Microbaridia delicatula n. sp. — Rather narrowly rhombic-oval, piceo-rufous, 

 not at all shining; scales parallel, yellowish or whitish, loosely placed and trans- 

 verse on the pronotum, rather closer broadly toward the sides and along the 

 middle, somewhat close on the strial intervals, but almost wanting for a short 

 distance on the fourth and sixth before the middle and inconspicuous medio- 

 apically, a little broader, dense and conspicuous throughout the under surface; 

 beak (cf ) slender, evenly cylindric and evenly arcuate, a little longer than the 

 head and prothorax, or ( $ ) one-half longer than the head and prothorax, evenly 

 and moderately arcuate, very slender, becoming gradually thicker basally; pro- 

 thorax a third to fourth wider than long, the sides nearly straight, feebly con- 

 verging, more oblique in apical two-fifths, the truncate apex not tubulate and 

 much more than half as wide as the base; punctures moderate and very dense 

 throughout; elytra triangular, with arcuate sides and rather narrowly rounded 

 apex, more than a fourth longer than wide, nearly a fourth wider than the pro- 

 thorax and distinctly more than twice as long, the intervals densely, confusedly 

 punctate, alternating somewhat in width, as wide as the coarse striae to nearly 

 twice as wide; abdomen densely squamose throughout in both sexes, very feebly 

 impressed medially toward base in the male. Length 1.8-2.6 mm.; width 

 0.8-1.2 mm. Brazil (Chapada — forest). On flowers in clearings. May and 

 November. Thirteen specimens. 



