148 Memoirs on the Coleoptera 



evenly cylindric throughout and very feebly arcuate, as long as the head 

 and prothorax and minutely, loosely punctulate; prothorax a fourth or 

 fifth wider than long, the sides feebly converging and broadly, subevenly 

 arcuate from base to the subobsolete apical constriction, the apex not dis- 

 tinctly tubulate and a little less than half as wide as the base; surface with 

 strong and close punctures, gradually becoming fine and sparse medially, 

 where there is a feebly defined smooth median line; basal lobe short, very 

 gradual, obtusely cuspidiform at apex; scutellum slightly impressed, ob- 

 trapezoidal; elytra evenly and somewhat obtusely oval, a fourth longer than 

 wide, a little wider than the prothorax and two-thirds longer, the humeri 

 rounded and feebly prominent; grooves strong, narrower toward the suture, 

 obscurely punctulate; intervals flat, with minute and remote punctules in 

 single line, all the intervals with very few fine pale squamules at base; sterna 

 coarsely, closely punctate; abdomen evenly convex, finely and sparsely 

 punctate throughout in the type. Length 3.4 mm.; width 1.75 mm. Brazil. 

 A single example, without further record of locality, sent by Desbrochers 



des Loges nigrina n. sp. 



Form slightly more elongate and somewhat larger, nearly similar in coloration 

 and sculpture; beak ( 9 ) as in the preceding but a little more shining and 

 somewhat longer, as long as the head and prothorax, the latter larger, only 

 a fifth wider than long, the sides similar but ending anteriorly at a more 

 pronounced constriction, the apex briefly but evidently tubulate; sculpture, 

 basal lobe and scutellum almost similar; elytra almost similar but somewhat 

 more elongate, and only three-fifths longer than the prothorax; grooves 

 coarser throughout; minute interstitial punctulation in single line but more 

 evident; sterna, abdomen and legs almost similar, the claw joint very 

 elongate in both species. Length 3.6 mm.; width 1.85 mm. Brazil (San- 

 tarem). One specimen riparia n. sp. 



These species, though rather closely allied, can be seen at once 

 to be distinct by the different form and size of the prothorax, with 

 more abruptly tubulate apex in riparia. 



Tudenia n. gen. 



The mandibles here differ very much from those of the preceding 

 genus in being widely overlapping or decussate, and the left, at 

 any rate, has within a very long acute and conspicuous tooth. 

 The beak is moderately thick, rather short and closely sculptured, 

 with smooth median line above toward base, and it is separated 

 from the head by only a feeble impression. The antennae are 

 medial, rather short, the first funicular joint longer than the two 

 following, two to seven short, rather compactly joined and gradually 

 wider, the club, however, rather abrupt, unusually elongate-oval, 

 with evident sutures, and as long as the entire funicle. The 

 prosternum has a broad and shallowly concave channel and the 

 coxa? are moderately separated. The femora are unarmed, strongly, 

 closely sculptured and slender, the tarsi shorter than the tibiae, with 

 moderately long, straight and slender claws, which appear to be 

 extremely approximate or contiguous, but perhaps not quite connate 

 at base. The prothorax is tubulate at apex, the scutellum small, 



