300 Memoirs on the Coleoptera 



Eusomenes n. gen. 



This and the four following genera constitute a group allied in 

 general features to the nearctic genus Dirabius, and also the palae- 

 arctic Limnobaris. They include the largest and broadest species 

 of the tribe, and are uniformly deep black in color. In Eusomenes 

 the body is oblong-oval, strongly convex and glabrous. The beak 

 is extremely short, thick, feebly arcuate, truncate, strongly sculp- 

 tured and separated from the head by a fine and somewhat shallow 

 sulcus; its dorsal outline in profile is subtumid medially in the male. 

 Antennae slightly beyond the middle, moderate in length, rather 

 rigid, with unusually short first funicular joint and moderate oval 

 club. The prosternum is fiat in both sexes, with a deep subtrans- 

 verse apical fossa, limited laterally by short ridges, not spinose in 

 the male, the coxae separated by about two-thirds of their width. 

 The third tarsal joint is oval, incised as usual and not much dilated, 

 the legs of normal type. The thoracic base is broadly arcuate, 

 without median lobe, the scutellum oblong, parallel or nearly so, 

 feebly impressed, free and with a few minute punctures, the elytral 

 striae consisting of scarcely impressed series of distinct oblong 

 punctures. There are two species as follows: 



Body stouter, feebly arcuate at the sides and shining, glabrous; beak ( o 71 ) scarcely, 

 or ( 9 ) somewhat more evidently more than, half as long as the prothorax, 

 antenna? piceous-black, the scrobes very oblique, the scape about attaining 

 the base; prothorax about as long as wide, the parallel sides feebly arcuate, 

 rounding in apical third to the short oblique tubulation, which is arcuate 

 medially at apex and much more than half as wide as the base; punctures 

 strong and deep, separated by but little more than their own diameters, 

 becoming fine medio-basally and with a narrow partial impunctate median 

 line; elytra one-half longer than wide, the sides only feebly oblique and 

 slightly arcuate, the apex obtusely rounded, only very little wider than the 

 prothorax and three-fourths longer, the humeri obtusely subprominent; 

 stria? very superficial, but deep at base, the large oblong punctures very 

 narrowly separated; intervals wide, with single series of rather coarse and 

 very close-set, almost nude punctures; male abdomen moderately but 

 deeply, loosely punctate, having along the middle basally a distinct simple 

 impression. Length 5.2-5.4 mm.; width 2.2-2.22 mm. Brazil (Chapada). 

 May and June. Two specimens curtirostris n. sp. 



Body much narrower, similar in color and lustre, glabrous and deep black through- 

 out; beak ( 9 ) not quite so thick as in the preceding, but only barely visibly 

 more than half as long as the prothorax, the antennae black; prothorax 

 when viewed in lateral profile, somewhat more convex, fully as long as wide, 

 the sides parallel and nearly straight only in barely basal half, thence more 

 gradually and very moderately arcuate to the subobsolete tubulation, which 

 is only very feebly arcuate — very much more widely and feebly than in the 

 preceding — and but little over half as wide as the base; punctures similar 

 but closer and not so modified medio-basally; scutellum narrower; elytra 

 longer, more than one-half longer than wide and but little less than twice as 

 long as the prothorax, the sides more nearly parallel, feebly arcuate, the apex 

 relatively still more broadly obtuse and rounded, the humeri subsimilar; 



