294 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



rectangular interspaces, the majority regular in form. Wings fully- 

 developed, (7) costal veins heavily clubbed distad, interval between 

 median and discoidal veins not as wide as greatest width between 

 median and ulnar veins, supplied with transverse veinlets, ulnar 

 vein unbranched, intercalated triangle well-developed. Median 

 segment mesad with a V-shaped rounded ridge, the apex cephalad 

 and supplied with agglutinated hairs, opposite this toward the ce- 

 phalic margin of the segment is a small tuft of agglutinated hairs 

 directed caudad. Supra-anal plate transverse, free margin broadly 

 convex, showing a slight angulation. Subgenital plate asymmetri- 

 cal, sinistral margin weakly convex an^ moderatey oblique to 

 slightly beyond median point, dextral margin weakly convex and 

 scarcely more strongly oblique. Sinistral style springing from a 

 slight emargination proximad on sinistral margin beneath cercus, 

 simple, cylindrical, very slender and nearly five times as long as wide. 

 Dextral style situated at apex of plate, simple and unarmed, very 

 similar to sinistral style except that it is slightly bent sinistro-caudad 

 at end of proximal third, thence tapering to the acute apex. 

 Ventro-cephalic margin of cephalic femora supplied with (1 or 2) 

 heavy proximal spines (in the latter case with spiniform hairs be- 

 ween) succeeded by a row of minute spiniform hairs, terminated by 

 two slender, elongate spines, of which the more distal is the longer; 

 ventro-caudal margin unarmed. Median femora with ventral mar- 

 gins supplied with hairs and distad with one, but no distal, slender, 

 chaetiform spine. Caudal femora with ventro-cephalic margin armed 

 distad with three, but no distal, well-developed though slender spines, 

 ventro-caudal margin armed distad with two similar spines. Geni- 

 cular spines of median and caudal femora small and very slender. 

 Caudal metatarsus slightly longer than combined length of succeeding 

 joints, pilose, with hairs of ventral surface almost spiniform, pulvilli 

 obsolete. Arolia small, but extending slightly over half distance to 

 apices of claws. 



Head buffy suffused with ochraceous-tawny, ocelli light buff, 

 eyes blackish mummy brown. Pronotum with disk dull ochraceous- 

 tawny, other portions transparent, weakly tinged with ochraceous- 

 buff as are the tegmina. Wings transparent very faintly tinged 

 with prouts brown, except between mediastine vein and costal mar- 

 gin where they are paler. Abdomen ochraceous-buff, slightly suf- 

 fused distad. Cerci ochraceous-tawny. Ventral surface and limbs 

 ochraceous-buff with a slight tawny tinge, except abdomen distad, 

 which is weakly suffused with einnamon-brown. 



Measurements {in millimeters). 



Length of Length of Width of Length of Width of 



cf body pronotvnn pronotum tegmen tegmen 



Averias, Argentina, paratype 7.2 1.8 1.95 7.3 2.2 



Icaiio, Argentina, paratype 7.2 1.7 6.7 2 



Cordoba, Argentina, type 8.5^-5 1.7 1.95 7.8 2.3 



^^* Abdomen considerably distended. 



