Brazilian Barin^e 91 



these to be the females. This assumed sexual difference is not 

 always so marked as it is in rivularis however. Sexual differences 

 of any kind are very slight. 



Harotreus n. gen. 



In most respects this genus is closely allied to Coleomerus, but it 

 differs greatly in habitus, due to the peculiar costiform elevation of 

 the strial intervals. The hind legs are very broad, the femora oval, 

 their close punctures bearing each a very small seta; the tibia is 

 not quite three times as long as wide as a rule, more setose, rounded 

 externally, minutely costulate and with series of coarse shallow 

 punctures. The antennal club is peculiar, being truncate at base, 

 symmetric and with deep sutures, the basal segment two-thirds 

 the mass; the eyes are very large and approximate, and the tarsal 

 claws are slender, free and divergent, as usual in the tribe. The 

 mesosternum, just outside of the middle coxae, is oblong and very 

 densely granular and opaque, contrasting greatly with the shining 

 remainder of the surface. The three species are as follows: 



Form very stout and convex, rhombic-suboval, polished, black; beak feebly 

 arcuate, three-sevenths as long as the body, finely and closely sculptured, 

 with a medial carina above basally, and, on each side, with a finer raised 

 thread; eyes separated by less than a fourth the width of the beak, with a 

 posterior fovea; head with large and close lunate punctures, which are very 

 shallow and with their floors micro-reticulate; prothorax three-fourths wider 

 than long, the converging sides feebly, subevenly arcuate to the dorsal ly 

 feebly impressed truncate apex, two-fifths as wide as the base, the basal 

 lobe distinct, obtusely rounded, rather gradual, the sides of the base oblique 

 and straight thence to the angles; surface minutely, remotely punctulate, 

 throughout the inferior flanks and obtuse lateral edges densely and strongly 

 punctate; scutellum small, wider than long, obtrapezoidal, with broadly 

 arcuate apex; elytra not quite as long as wide, nearly a third wider than 

 the prothorax and somewhat more than twice as long, obtusely oval, with 

 rather prominent but broadly rounded humeri; grooves deep, minutely, 

 remotely punctulate at the bottom, the intervals smooth, the cariniform 

 costse outside of the median line of each; abdomen very convex, finely, 

 rather closely punctate. Length 3.0 mm.; width 2.35 mm. Brazil (Cha- 

 pada — forest). September. One specimen — probably female. 



chapadanus n. sp. 



Form less abbreviated and more evenly oval, similar in color and lustre; beak 

 more feebly arcuate, thicker and shorter, not longer than the head and 

 prothorax, more compressed at the sides, the median and lateral carinae of 

 the upper surface more obtuse; sculpture nearly similar; eyes separated by 

 less than a fourth the rostral width, more pointed beneath than in chapadanus, 

 the punctures of the head much smaller, less shallow and oval in form; 

 prothorax longer, only three-fifths wider than long, conical, with very feebly 

 arcuate sides, the sculpture similar; scutellum slightly more transverse; 

 elytra nearly similar, except that they are slightly longer than wide and 

 much less broadly obtuse at apex; abdomen more finely and sparsely punc- 

 tate, very faintly subimpressed medially at base. Length 3.3 mm.; width 

 2.25 mm. Cayenne. One male specimen, sent by Desbrochers des Loges. 



lyratus Desb. 



