306 Memoirs on the Coleoptera 



whiter scales, which are narrowly separated; beak (o 71 ) as long as the prothorax, 

 moderately and evenly arcuate, not quite as thick as the anterior femora, very 

 moderately and sparsely punctate, sparsely squamulose at the extreme base; 

 antennae dark rufous, at four-sevenths; prothorax fully three-sevenths wider 

 than long, the sides parallel and nearly straight, circularly arcuate beyond the 

 middle to the truncate apex, which is less than half as wide as the base; punctures 

 rather small but deep and somewhat sparse, dense anteriorly and laterally, with 

 elongate vacant sublateral spaces and a broad smooth median line, not attaining 

 the apex; elytra three-sevenths longer than wide, with straight parallel sides, 

 circularly rounding in apical third, only just visibly wider than the prothorax 

 and nearly two and one-half times as long, the humeri slightly swollen; intervals 

 finely, loosely and confusedly punctate, the three densely squamose ones the 

 widest; male abdomen feebly impressed medially toward base, the prosternal 

 spines short and thick, about as long as the femoral thickness. Length 6.3 mm.; 

 width 3.0 mm. Brazil (Chapada). May. One specimen. 



This is one of the more remarkable and isolated of the Brazilian 

 Barinse. 



Valdenus n. gen. 



Here, the scheme of generic organization makes another departure, 

 in the direction of the subarctic genus Sibariops, which also occurs 

 in Brazil. In the present genus the body is narrow, parallel, moder- 

 ately convex, polished and glabrous, somewhat resembling, in dorsal 

 aspect, the Tenebrionid genus Echoceras. The beak is more or less 

 slender, cylindric, smooth or feebly sculptured, and is separated 

 from the head by an extremely feeble to obsolete impression. The 

 antenna? are submedian, with very feebly oblique scrobes, the first 

 funicular joint longer than the next two, which are not elongate, 

 the club oval, rather abrupt, as long as the four preceding joints, 

 and subequally divided by the evident sutures. The prosternum 

 is feebly impressed along the middle, not spinose in the male and 

 separates the coxae by less than half their width. The legs are 

 slender, shining and subglabrous, the tarsi moderately slender, the 

 first joint of the posterior longer than the second, the claws rather 

 small and slender. The prothorax is not tubulate at apex, the 

 basal margin feebly arcuate at the middle, but without a definite 

 median lobe, the scutellum subparallel, free and longer than wide, 

 and the elytra with abrupt and rather fine deep grooves. There 

 are six species at hand as follows: 



Seventh and eighth elytral grooves abruptly terminating some distance behind 

 the humeri. Body stouter and more convex than in any other, dark rufous 

 and polished throughout, glabrous, excepting some fine close whitish squam- 

 ules on the met-episterna and a few others along the sides of the prosternal 

 depression; beak (o 71 ) slightly shorter, or ( 9 ) a little longer, than the head 

 and prothorax, cylindric, very smooth and feebly arcuate, the punctures 

 minute and sparse, gradually a little closer basally; antennae, just behind 

 (9), or very slightly beyond (o 71 ), the middle; prothorax a fourth wider 

 than long, strongly convex, the sides broadly arcuate, becoming straighter 

 and parallel behind about the middle; punctures minute and very remote 



