Brazilian Barin^e • 219 



Valliopsis and Anavalins, but nowhere to so pronounced a degree 

 as here, and the hind tibiae are not materially modified sexually in any 

 other genus, so far as known. The abdominal characters in the type 

 of convexa are extremely remarkable for the female, if I have correctly 

 identified that sex, where such very distinctive modifications are 

 very rare in the Barinae. 



Revena n. gen. 



The body in this genus is also rhombic-suboval, black and gla- 

 brous, except that each of the strong punctures of the under surface 

 bears a minute whitish squamule, and the upper surface is distinctly, 

 sparsely punctate, the prothorax relatively much larger, distinctly 

 but less abruptly tubulate at apex, the constriction not marked 

 by very coarse punctures as in some species of the preceding 

 genus; the intervals between the coarse elytral grooves are not 

 exactly flat, though nearly so. The beak is rather long and slender 

 and differs greatly in the sexes, being nearly straight, very slender 

 and smooth, abruptly inflated and cparsely, closely punctate behind 

 the subbasal antennae in the female, and subevenly, moderately 

 arcuate, not so slender, more sculptured and only feebly inflated 

 basally in the male; it is not separated from the head by a transverse 

 impression of any kind, and the mandibles are rather stout but 

 prominent when closed and with straight, even inner margins. The 

 antennae are at basal fourth ( 9 ) or barely beyond (o 71 ), long and 

 slender, all the funicular joints elongate, the first greatly so, the 

 second but little shorter and as long as the next two, the seventh 

 more elongate than the sixth and obconic, the club small, with 

 large basal segment and conically pointed, not as long as the two 

 preceding joints (9), a little longer (o 71 )- The anterior coxae are 

 separated by their own width, the prosternum flat, broadly and 

 feebly, medially impressed anteriorly, and it is nearly similar in 

 the sexes. The abdomen is simply impressed medio-basally in both 

 sexes and similarly sparsely punctate, but the impression is a little 

 larger in the female. The two species now before me are as follows: 



Form rhombic-suboval ( 9 ) or regularly oval (d*), deep black and shining, the 

 elytra feebly alutaceous in the female; beak (o 71 ) as long as the head and 

 prothorax, evenly and moderately arcuate and strongly sculptured, or ( 9 ) 

 nearly straight, smooth, very slender, dilated and sculptured at base and 

 distinctly longer; antennae long, slender, the scape only a little longer than 

 the first funicular joint; prothorax a fifth ( 9 ) to a fourth (c?) wider than 

 long, the sides moderately converging and very evenly, moderately arcuate 

 from base to the constriction, the apex two-fifths as wide as the base (o 71 ), 

 less ( 9 ) ; basal lobe very gradually cuspidiform, with narrowly obtuse apex; 

 punctures fine and remote, coarser in the broad constriction, also at the 

 extreme sides and along the basal margin; scutellum wider than long, 

 truncate, smooth and feebly impressed, distinctly obtrapezoidal, the oblique 

 sides slightly arcuate; elytra a fourth (o 71 ) to a third (9) longer than wide, 



