262 Memoirs on the Coleoptera 



basally, but not differently sculptured or clothed, the prosternal spines 

 oblique, gradually broader and strongly compressed basally, as long as the 

 prothorax or slightly longer. Length 4.4-4.8 mm.; width 2.2-2.35 mm - 

 Brazil (Santarem). Two male specimens thoracicus n. sp. 



Body as in the preceding but narrower, with much smaller prothorax and with 

 more oblique elytral squamose areas, which often meet on the suture; beak 

 (o 71 ) nearly similar but shorter, as long as the elytra, or ( 9 ) rather shorter 

 than the elytra and less arcuate, being more arcuate basally than beyond; 

 antennae rufous, submedial in both sexes, nearly as in the preceding but 

 somewhat shorter, the first funicular joint almost as long as the next three; 

 prothorax fully a fourth wider than long, the sides subevenly and strongly 

 arcuate, gradually more parallel posteriorly, the tubulation but little less 

 than half as wide as the base, the latter similar and also finely beaded, 

 somewhat as in Cylindrocerus; scutellum rather larger and less transverse, 

 very smooth and quadric; elytra nearly similar but more narrowly rounded 

 at apex, a fourth wider than the prothorax and not quite twice as long, the 

 grooves not so completely obsolete basally, being traceable as very fine lines, 

 which are distinct in the female; male abdomen with a narrower and deeper 

 but unmodified impression along the middle basally, the prosternal spines 

 less developed and much less broadly compressed basally, varying from a 

 rudimentary triangular tubercle to four-fifths as long as the prothorax. 

 Length 3.3-4.2 mm.; width 1.65-2. 1 mm. Brazil (Santarem). Five males 

 and one female laetulus n. sp. 



Body still smaller and narrower, with shorter prothorax, the squamose areas of 

 the elytra broadly confluent on the suture, forming a large transversely 

 reniform spot; color, lustre and sculpture almost similar; beak (o 71 ) more 

 slender, strongly, evenly arcuate, rather finely, sparsely punctate and as 

 long as the elytra; antennae rufous and nearly similar; prothorax more 

 than a third wider than long, the strongly arcuate sides becoming parallel 

 basally, the tubulation half as wide as the base, the latter and scutellum 

 almost similar; elytra nearly similar in structure, but relatively narrower 

 and more elongate, a fifth wider than the prothorax and distinctly more 

 than twice as long, the humeri still more narrowly rounded; grooves obsolete 

 at base; male abdomen with a feeble basal impression, almost wholly im- 

 punctate and more sharply defined along the bottom than in Icetidus, the 

 prosternal spines forming short and very obtuse angular tubercles in the 

 type. Length 3.4 mm.; width 1.65 mm. Brazil (Santarem). One speci- 

 men macilentus n. sp. 



II — Form stouter, color deep black throughout, very shining, wholly glabrous 

 above, each of the rather strong close punctures of the under surface bearing 

 a minute whitish squamule; inferior flanks of the prothorax with feeble 

 wavy longitudinal rugae; beak strongly arcuate, compressed basally but 

 almost impunctate, nearly three-fourths as long as the body, relatively not 

 quite so long, less arcuate and much more arcuate basally than apically in 

 the female, this feature also visible to some extent in the male; antennae 

 slender, blackish, medial ( 9 ) or slightly beyond (a 71 ), the scape extending 

 about half way to the eye, the first funicular joint fully as long as the next 

 three, the elongate-oval club longer than the preceding four joints; prothorax 

 campanulate, a third wider than long, the strongly arcuate sides becoming 

 parallel at base, the tubulation not half as wide as the base, though nearly so 

 in the female; basal margin with a deep eroded line, the lobe gradual and 

 rounded; scutellum strongly transverse, narrowed slightly at base; elytra 

 only a fourth or fifth longer than wide, with the usual rather distinct humeri, 

 the oblique sides broadly arcuate and the apex not very narrowly rounded, 

 distinctly wider than the prothorax and three-fourths longer, the grooves 



