364 Memoirs on the Coleoptera 



densely pubescent, with glabrous basal margin and as long as the 

 preceding five joints. The prosternum is shallowly and not abruptly 

 canalate, the coxae separated by but little more than their own 

 width, and the legs slender and with mutic subglabrous femora, 

 and the fourth tarsal joint longer than the remainder, with strong 

 diverging claws. The prothorax is extremely briefly subtubulate, 

 the basal lobe large and strongly, evenly rounded, the scutellum 

 small, transversely sublunate and free, and the elytra are abruptly, 

 deeply grooved, very coarsely exarate behind the middle, with 

 distinct subapical umbones and broadly tumid humeri. The 

 pygidium is small, transverse and divided by an entire transverse 

 ridge, the upper part oblique, the lower vertical. The type is 

 as follows: 



Sirabia undulata n. sp. — Shining, convex, glabrous, piceous, with strong aeneous 

 lustre; beak .subsimilar in the sexes, cylindric, thick, finely, loosely punctate, as 

 long as the head and prothorax, slightly longer in the apparent female, the antennae 

 ferruginous; prothorax short, fully four-fifths wider than long, the sides strongly, 

 subevenly arcuate, gradually becoming parallel toward base, the truncate apex 

 only two-fifths as wide as the base; punctures rather small but strong and deep, 

 separated by their own diameters, a little stronger, denser and longitudinally 

 rugulose at the sides and becoming obsolete medio-basally; elytra a fourth to 

 third longer than wide, oval, with the sides feebly sinuate near the medially 

 obtuse apex, a fifth or sixth wider than the prothorax and two and one-half 

 times as long; grooves moderate, coarse and punctate laterally, coarsely exarate, 

 with prominent intervals posteriorly, the intervals flat internally before the 

 middle, cariniform laterally, minutely, loosely and confusedly punctulate, the 

 surface very conspicuously undulated; abdomen convex, in great part very 

 smooth and subimpunctate. Length 3.8-4.25 mm.; width 2.0-2.4 mm. Brazil 

 (Santarem). Seven specimens. 



Either sexual differences are wholly undeveloped, or my material 

 is entirely female; it is not practicable however to state anything 

 definitely without dissection. 



Rytonia n. gen. 



This and the next are singularly aberrant genera, having a small 

 oval convex and in great part glabrous shining body and apparently 

 very feebly marked sexual characters. The beak is short, rather 

 thick, feebly arcuate, evenly tapering and strongly compressed, 

 with flat sides, separated by only the feeblest narrow impression and 

 with bifid decussate mandibles. The antennae are at apical third 

 ( 9 ) or slightly beyond (o 71 ), with long scape, the first funicular 

 joint longer than the next three, the second one-half longer than 

 wide, the others short, transverse and rather compact, increasing in 

 width, the seventh as wide as the truncate base of the club, which is 

 elongate-oval, densely pubescent, with fine sutures, as long as the 



