498 Memoirs on the Coleoptera 



dilated and the claws free. The male sometimes has a long narrow 

 abdominal impression toward base. The four species before me 

 are as follows: 



Median line of the pronotum distinctly prominent in apical half. Body notably 

 small and slender, polished, rufo-piceous, the elytra blacker; beak moderately 

 thick, as long as the prothorax, finely, sparsely punctate, scarcely arcuate, 

 gradually somewhat bent distally; antenna? at four-sevenths, the scape not 

 attaining the eye, the club notably large and thick, as long as the preceding 

 six joints; prothorax a fifth longef than wide, the sides feebly arcuate apically, 

 parallel and slightly so basally and oblique and straight between these 

 limits; apex half as wide as the base; punctures in apical half moderately 

 coarse and separated by their widths or but little more, finer medially, in 

 posterior half minute, very remote and almost obsolete; elytra two and 

 one-half times as long as wide, subparallel, obtusely rounded at apex, sub- 

 equal in width to the prothorax and evidently more than twice as long, the 

 humeri not tumid;' striae very fine and subobsolete, but with the punctures 

 distinct though fine and well separated; intervals smooth; pygidium very 

 short, three or four times as wide as long, the punctures uneven, slightly 

 separated; fifth ventral flattened medially, the apex sinuato-truncate in the 

 type. Length 5.35 mm.; width 1.35 mm. Brazil (Santarem). One speci- 

 men, which, from the form of the fifth ventral, may possibly be the male, 

 though there is no basal abdominal impression. seriatellus n. sp. 



Median thoracic line not or only very indefinitely subprominent; size larger.. .2 



2 — Body extremely elongate-suboval, convex and polished, black throughout, 

 the fourth tarsal joint rufous; beak (c?) as long as the head and prothorax, 

 moderately thick, straight, arcuate distally, finely but deeply, rather closely 

 punctate; antennae near three-fifths, rather short, piceous, the scape not 

 attaining the eye, the club narrowly oval, more than twice as long as wide, 

 gradually pointed, as long as the five preceding joints and subequally divided 

 by the sutures; prothorax two-fifths longer than wide, the sides evenly and 

 very distinctly arcuate from base to apex, parallel at the extreme base; 

 apex truncate, fully half as wide as the base; punctures strong and somewhat 

 close in about apical half, gradually fine and remote thence posteriorly, with 

 an elongate vacant space at lateral fourth, extending to apical third; scu- 

 tellum narrowed slightly toward base; elytra two and three-fourths times as 

 long as wide, at base as wide as the prothorax, two and two-fifths times as 

 long, the sides feebly oblique and nearly straight, the apex obtusely rounded; 

 striae obsolete but marked by series of minute punctures, the deeply exarate 

 apex as described above; pygidium feebly convex, finely, densely punctate, 

 fully three times as wide as long; male abdomen with a narrow impression 

 along the middle in almost basal half, the fifth segment feebly impressed and 

 sinuato-truncate. Length 7.0 mm.; width 1.8 mm. Brazil (Santarem). 

 One specimen arcuatus n. sp. 



Body slender, parallel and convex; coloration as in the preceding, except that 

 the prothorax is faintly piceo-rufous; surface shining; beak in the type 

 rather short, evenly cylindric, only moderately slender, straight, bent at the 

 antennae, finely, more sparsely punctate and only four-fifths as long as the 

 prothorax; antennae at four-sevenths, piceous, the club thicker, scarcely 

 twice as long as wide, gradually pointed, pubescent throughout, as long as 

 the five preceding joints, its first segment longer than the second; prothorax 

 scarcely a fifth longer than wide, the sides evenly but only very feebly 

 arcuate from base to apex, the latter truncate and almost four-sevenths as 

 wide as the base; punctures small but strong and separated by twice their 



