362 ♦ Memoirs on the Coleoptera 



apically, the punctures small but very distinct; intervals wide and smooth; 

 propygidium finely, densely punctate, medially carinate, the pygidium large, 

 more coarsely and loosely punctate, vertical, semicircular and with a strong 

 submedial umbo; abdomen minutely and remotely punctulate. Length 

 7.9-8.0 mm.; width 3.7-3.75 mm. Brazil (Rio de Janeiro). Three speci- 

 mens atrolucens n. sp. 



Antenna? more slender, the first funicular joint less elongate, about equal to the 

 next three, the outer joints barely at all wider, the club much more abrupt.. 2 



2 — Pygidium small, vertical, semicircular, coarsely, densely punctate and medially 

 carinate. Body oval, convex, deep black, smooth and polished; beak (9) 

 as long as the head and prothorax, slender, slightly flattened distally, nearly 

 straight and smooth, rapidly very thick and strongly compressed, arcuate 

 and with the flat compressed sides alutaceous and finely, sparsely punctate 

 behind the antenna?, which are piceo-rufous in color and behind basal third; 

 prothorax a third wider than long, the evidently converging sides straight, 

 gradually circularly rounding from slightly beyond the middle to tubulation, 

 which is similarly evenly truncate and half as wide as the base; surface 

 almost impunctate, except minutely and sparsely at the sides; scutellum 

 similar but in closer contact with the elytra, the latter but little over a third 

 longer than wide, obtusely oval and slightly undulated, with prominent 

 subapical umbones and tumid humeri, a fifth wider than the prothorax and 

 twice as long; grooves narrow but sharply defined and deep, only the first 

 becoming a series of small punctures toward base; abdomen finely, remotely 

 punctulate, the first suture very distinct. Length 5.2 mm.; width 2.6 mm. 

 Brazil (Rio de Janeiro). October. One specimen minor n. sp. 



Pygidium in both sexes more elongate, oblique, strongly rounded and slightly 

 tumid at apex, with the surface even and closely but discretely punctate. 

 Body more narrowly oval, convex, polished, black and smooth; beak (cf) 

 thick, moderately arcuate, compressed and punctulate basally and four- 

 fifths as long as the prothorax, or more, the antennae blackish, submedial in 

 both sexes; prothorax a third wider than long, the sides distinctly converging, 

 feebly arcuate, more rapidly rounding anteriad to the tubulation, which is 

 half as wide as the base, or somewhat less; surface smooth, feebly punctate 

 at the extreme sides; scutellum as in minor; elytra oval, three-fifths longer 

 than wide, with moderately swollen humeri and very moderate umbones, 

 barely at all wider than the prothorax and nearly twice as long; striae very 

 fine, obsolete and punctulate, becoming gradually deep and sharply defined 

 impunctate grooves laterally, somewhat exarate at tip; intervals smooth; 

 under surface almost similar; abdomen without sexual modification; pro- 

 sternum similarly sinuate at the posterior margin. Length 5.2-5.6 mm.; 

 width 2.3-2.4 mm. Brazil (Santarem). Three specimens... obsidianus n. sp. 



As can be perceived readily, there are two distinct structural 

 types among the above three species, which constitute in all proba- 

 bility two subgeneric groups. 



Stenohulpes n. gen. 



The body in this genus is parallel, strongly convex, smooth, 

 polished and glabrous. The beak rather slender, cylindric, not 

 separated from the head, the mandibles thick, arcuate, deeply bifid 

 and decussate. Eyes large, separated on the front by somewhat 

 less than the width of the beak; antennae medial, somewhat slender, 



