Brazilian Baring 323 



along the median line; abdomen smooth, minutely, remotely punctulate at 

 base. Length 8.4 mm.; width 3.15 mm. Brazil (Santarem). One speci- 

 men conicicauda n. sp. 



Elongate-oval, narrower than the preceding and almost similar in color and 

 sculpture; beak (9) somewhat longer than the body, as in the preceding, 

 except that the basal thickening is very gradual and has the punctures a 

 little smaller and sparser; antennae somewhat shorter, with thicker club, 

 piceo-rufous in color; prothorax narrower, about a fourth longer than wide, 

 not inflated posteriorly and widest at base, the sides more feebly arcuate, 

 the tubulation and sculpture subsimilar; minute basal lobe more gradually 

 formed and not truncate, but strongly rounded at tip; elytra much narrower 

 and more elongate, two-thirds longer than wide, a fifth wider and three-fifths 

 longer than the prothorax, the general outline and sculpture nearly similar; 

 pygidium more narrowly triangular, with rather more arcuate sides and with 

 the similarly distinct punctures very much sparser, the median line tumescent 

 only toward base; mes-epimera visible from above as in the two preceding 

 species; abdomen nearly as in conicicauda. Length 8.0 mm.; width 2.85 

 mm. Brazil (Amazon Valley). One specimen longirostris n. sp. 



The type of longirostris was received from Desbrochers des Loges 

 with the legend "n. gen. (Jekel) or Dactylocrepis Db., Amazons, 

 rare." Dactylocrepis is of course a widely different genus, allied to 

 Cylindrocerus. There does not seem to be much doubt of the 

 specific distinctness of the types of binarius and conicicauda, though 

 represented by a single male and female respectively, and they are 

 from the same locality; marked difference in pronotal sculpture is, 

 so far as observable, never a purely sexual character. If there 

 should prove to be but a single species, however, the sexual differ- 

 ences in the beak in this genus would be far greater than in any 

 other known to me. 



Tribe Madarini 



The chief distinguishing feature of this tribal group is the virtually 

 uninterrupted surfaces of the pro-, meso- and metasternum, and, in 

 typical genera, such as Madams, this is a manifest reality, but there 

 are many cases in which there is merely an approximation to the 

 structure seen in Madams. The anterior coxse are remotely sep- 

 arated as a rule, but in some genera, such as Rytonia, these coxae 

 become as close-set as in most of the Centrinini. The pygidium is 

 usually fully exposed behind the elytra and is more vertical in the 

 female, but in a group placed at the beginning of the table given 

 below, there is no more vestige of an exposed pygidium than in the 

 tribes before the Sonnetiini, as arranged in the present work, and, 

 were it not for the uniform level of the sterna, they would of course 

 have to be considered Centrinids, to which they also bear a striking 

 external resemblance. 



The Madarini constitute perhaps the most interesting of the 

 Barid tribes, because of their very diversified and remarkable 

 structural features, such as the long rostrum — or as I have termed 



