1921] NATURAL SCIENCES OF PHILADELPHIA. 271 



ized to that of rufo, but shorter and proportionately broader. Sub- 

 genital plate strongly asymmetrical as characteristic of genus, much 

 as in 7'ufa except that the larger style is slightly heavier, less than 

 three times as broad as long and not twice as long (varying in the 

 series to nearly twice as long) as the unarmed sinistral style. 

 Allotype: 9 ; same data as type. [Hebard Collection.] 

 Similar to male in ambisexual characters except those of color- 

 ation. Size larger, form appreciably broader with pronotum more 

 ample. Head with intcrocular space slightly narrower, (varying 

 in the series to slightly wider) than that between the ocelli. Pro- 

 notum with discal sulci weak. Tegmina and wings broader than 

 in male, surpassing the cereal apices (to different degrees in the 

 series but never by as much as in the opposite sex). Supra-anal 

 plate with lateral portions of free margin very strongly convergent 

 and broadly convex to median produced portion, this portion with 

 margin convex, nearly forming a semicircle (one paratype shows 

 slightly greater convexity at the apex than elsewhere in the margin 

 of the produced portion). Subgenital plate convex, free margin 

 broadly convex, except below cerci, where it is broadly concave. 



Measurements {in millimeters) . 



Length of Length of Width of Length of Width of 

 cT body pronotum pronotum legmen tegmen 



Paraguay' 



San Nicolas, Argentina, type 14.3 



San Nicolas, Argentina, para- 13-15 



types (3) 

 Carcarana, Argentina 

 Cordoba, Argentina 



9 



San Nicolas, Argentina, allo- 

 type 



San Nicolas, Argentina, para- 

 types (10) 



Carcaraiia, Argentina (2) 



Icano, Argentina 



Coloration. Male. Head with vertex and inter-ocular-ocellar 

 area auburn, ocelli warm buff, other portions cinnamon-buff show- 

 ing a very faint tawny tinge. Antennae with proximal joints 

 cinnamon-buff, remaining portions bister. Pronotum light och- 

 raceous-tawny. Tegmina ochraceous-buff, tinged with tawny ex- 

 cept in marginal fields. Dorsal surface of abdomen blackish chest- 

 nut brown. Ventral surfaces of thoracic segments and all of limbs 

 cinnamon-buff showing a very faint tawny tinge, spines tawny. 

 Ventral surface of abdomen cinnamon brown, gradually deepening 

 to blackish chestnut brown laterad and distad. 



Female similarly colored except that the pronotum is tawny, the 

 tegmina tawny, except in marginal field, which is ochraceous-tawny. 

 The series of females at hand shows, a considerable amount of in- 

 tensification and recession of color, all, however, being more tawny 



