JAMES A. G. REHN 189 



doubtless other features of difference not discussed in the rather 

 unsatisfactory, merely diagnostic description of brasilie7isis. 

 From argentina, the genotype, and chopardi, the remaining species 

 of the genus, both of which are now before us, the present species 

 is immediately separable by its more elongate pronotum, which 

 shows a tendency toward Musonia. 



Type. — cf ; Ypiranga, State of Sao Paulo, Brazil. February, 

 1913. (H. Luderwaldt.) [Acad. Nat. Sci. Phila., Type no. 

 5271.] 



Size medium (for the genus): form elongate, slender. Head broad, the 

 greatest width across the eyes equal to one and one-half times the supra-coxal 

 width of the pronotum, the greatest depth of the head contained one and three- 

 eighths times in the greatest width of the same; occipital line transverse sub- 

 truncate between the juxta-ocular sulci, which are well indicated and distinctly 

 separate the rounded obtuse juxta-ocular lobes from the occi])ut proper, 

 juxta-ocular sulci following the curve of the internal margins of the eyes and 

 converging ventrad; ocelli large, prominent, placed in a triangle which is 

 slightly deeper than broad; facial shield strongly transverse, its greatest depth 

 contained two and one-half times in the greatest width, dorsal margin obtuse- 

 angulate, the dorso-lateral angles rectangulate, the lateral margins slightly 

 converging ventrad, the ventral margin faintly arcuato-emarginate, the surface 

 of the plate subimpressed: eyes subglobose when seen from the dorsum, full and 

 reniform in shape when seen from the cephalic aspect, in basal outline broad 

 ovoid: antennae about two-thirds as long as the body, the articles moniliform, 

 particularly distad. Pronotum moderately elongate, the greatest width across 

 the supra-coxal expansion contained three times in the greatest length of the 

 same; collar narrowing cephalad, the distal extremity rather narrowly rounded, 

 the expansions very weak, rounded, shaft subequal in width, appreciably 

 broader than the collar; lateral margins finely and rather distantly serrulate; 

 shaft one and one-half times as long as the collar; medio-longitudinal carina 

 distinct but not high, sub-obsolete cephalad; transverse impression arcuate, 

 obli(|ue lateral impressions on the collar distinct. Tegmina when in repose 

 slightly surpassing the apex of the subgenital plate, broad, the greatest width, 

 which is at the distal fourth, contained nearly four times in the greatest length 

 of the tegmen; costal margin appreciably arcuate briefly proximad and distad, 

 the apex rounded sub-acute: marginal field narrow; numerous cross nervures 

 in the discoidal field with distinct thickening at their juncture with the main 

 \eins. Wings, when in repose, surpassing the apices of the tegmina bj- about 

 two millimeters, the greatest width shghtlj- less than one-half the length of the 

 wing; costal margin straight except for a brief but distinct arcuation distad, 

 where the margin rounds to the broadly rounded acute apex: ulnar vein bira- 

 niose; transverse nervures in the vicinity of the humeral trunk and of the 

 ulnar vein thickened as in the tegmina. Form of the supra-anal plate not 

 clearly definai)le, in general transverse; cerci incomplete; subgenital plate 



TRANS. AM. ENT. SOC, XLIV. 



