116 INSECUTOR INSCITI^ MENSTRUUS 



descent, strongly infuscated on the costal half ; scales narrow 

 and all dark. 



Types, three females, No. 25755, U. S. Nat. Mus. ; Gran 

 Chaco, margin of the River Tapenaga, Colonia Florencia, 

 Argentina, 1903 (E.-R. Wagner). The specimens were re- 

 ceived from the Paris Museum, through M. E. Seguy, and 

 others have been returned to that institution. 



Allied to holmbergii, but differing in the absence of the two 

 sublateral mesonotal black stripes, which are replaced by gray 

 scales. The abdomen also is conspicuously -pale-scaled and 

 appears very light gray, not nearly black, as holmbergii is 

 described. 



Psorophora stigmatephora, new species. 



Head clothed with light gray scales. Mesonotum with dense 

 light gray scales, slightly yellowish, the median bare stripes 

 strongly narrov»^ed, linear, joining posteriorly in the ante- 

 scutellar space ; posterior bare spaces separated, the integument 

 here black and polished ; a small oval patch of black scales on 

 each side of the middle; central lines of scales gray, tinged 

 with golden anteriorly (PI. IV, fig. 5). Abdominal scales light 

 gray, but partly denuded in the material, precluding notation 

 of details ; ventral scales entirely light gray, sparsely placed. 

 Palpi and legs with many coarse outstanding scales, especially 

 on tips of femora and tibiae, black, mixed with pale; tarsi 

 black, with broad whitish rings at the bases of the joints. 

 Wings with the costal half very lightly infuscated ; scales nar- 

 row, black, intermixed with whitish ones, especially along 

 costal region. 



In the male hypopygium the filament on the claspette differs 

 in shape from that of ciliata and tibialis, being smaller, nar- 

 rower, the tip not hooked, but ending in a little sharp spiral 

 point. The claspers also differ, being narrower, with recurved 

 margins, the two points at the tip subequal, curved laterally 

 and parallel. 



Types, two females and one male, No. 25756, U. S. Nat. 

 Mus.; the females, Asuncion, Paraguay, 1919 (Dr. Migone), 



