Brazilian Barin/E 57 



elongate-oval fovea. The most remarkable feature of the genus 

 resides, however, in the rostrum, which differs very much in the 

 sexes; in the male it is rather thick, feebly arcuate, slightly com- 

 pressed, not modified distally and strongly sculptured, but in the 

 female it is almost similarly stout and sculptured basally behind 

 the antennae, but thence to the apex becomes strongly flattened 

 and smooth, equally wide dorsally but very slender in profile; the 

 antennae are well behind the middle in the male but rather behind 

 basal third in the female, moderate in length, with small, subglobular 

 and rather shining club in both sexes, having the sutures distinct; 

 the basal joint of the funicle is as long as the next two or three. 

 The mandibles, also, are very peculiar, being subquadrate, coming 

 together on a short straight line, the inner part of their apices 

 slightly prolonged. The type may be described as follows: 



Matrilia diversirostris n. sp. — Form suboval, pale testaceous throughout, the 

 legs piceous-black; beak ( 9 ) not quite as long as the prothorax, rather strongly, 

 evenly arcuate, or (cf) about three-fourths as long, thicker and less arcuate; 

 prothorax a fifth wider than long, the sides rather feebly converging and scarcely 

 arcuate, rapidly rounding anteriorly to the pronounced tubulation, which is 

 not quite half as wide as the base; surface even, having only the sparse infini- 

 tesimal punctules of most of the Diorymeri; basal lobe moderate, rounded, feebly 

 punctulate; scutellum as described above; elytra elongate- parabolic, a fourth 

 wider and two-thirds longer than the prothorax, the subapical elevations pro- 

 nounced, giving an obtuse posterior aspect when viewed antero-obliquely; humeri 

 moderate, though rather prominently rounded; striae somewhat coarse, deep and 

 grooved throughout; intervals flat, smooth; under surface moderately and not 

 densely punctate, the abdomen sparsely and finely, the mes-epimera coarsely and 

 closely, but not deeply. Length 2.2-2.35 mm.; width 1 .2-1 .3 mm. Brazil 

 (Chapada — forest). October. Two specimens. 



While undoubtedly one of the Diorymerini, this species is alto- 

 gether exceptional in rostral and mandibular characters. 



Prodinus n. gen. 



In this genus, as represented by the typical species, the anterior 

 coxae are separated by about two-thirds of their width, the channel 

 before them differing from anything observable in the preceding 

 genera, in being shallow, concave, not abruptly limited at the sides 

 and far narrower than the beak; the mandibles are rather long, 

 overlap moderately when closed, with an acutely ogival combined 

 outline, and are strongly bifid at apex, being of the usual type in 

 this tribe. The antennae are medial, the first funicular joint as 

 long as the next three, and the club small, oval and pointed, about 

 half as long as the funicle. The body is oval, with strongly tubulate 

 prothorax, rather small scutellum and grooved elytra, and the first 

 abdominal segment is swollen somewhat as in Hiotus. The tibiae 

 are acutely toothed externally at base, the third tarsal joint well 



