1921] NATURAL SCIENCES OF PHILADELPHIA. 269 



and armed with minute spines. Armament of limbs as character- 

 istic of the genus. Four proximal tarsal joints supplied distad 

 with small but readily observed pul villi. Moderately well devel- 

 oped arolia present between the slender, simple, symmetrical tarsal 

 claws. 



Allotype: 9 ; Buenos Aires, Buenos Aires, Argentina. [Paris 

 Museum.] 



Agrees with macropterous male type except in the following 

 characters. Size larger, form broader. Interocular space dis- 

 tinctly wider than that between antennal sockets. Ocellar spots 

 smaller, ocellar areas not differentiated. Pronotum with latero- 

 caudal sulci of disk obsolete; greatest width at latero-caudal angles; 

 caudal margin truncate, very broadly convex, transverse. Teg- 

 mina minute, rounded triangular, broad, lateral pads, extending 

 only slightly beyond caudal margin of mesonotum, but wdth ven- 

 ation distinct. Wings absent. Supra-anal plate sUghtly less than 

 half as long as its basal width, triangularly produced with apex 

 sharply rounded. Subgenital plate convex, with free margin 

 broadly convex. Limbs slightly heavier. 



Three brachj^pterous males, which we have discussed above, 

 agree in all but genitalic features with the allotype, except that 

 the interocular space is only slightly wider than that between the 

 antennal sockets. 



Head shining blackish, ocellar spots buffy, palpi blackish chest- 

 nut brown, mouth -parts cinnamon brown. Pronotum solidly black- 

 ish. Tegmina of male blackish and opaque proximad, weakening 

 mesad, becoming translucent tinged with prouts brown, and trans- 

 parent distad, very weakly tinged with prouts brown, as is the area 

 of the dexti-al tegmen wdiich is concealed when at rest. Tegmina 

 of female blackish and opaque. Body, cerci, coxae and femora 

 blackish chestnut brown. Tibiae and tarsi tawny. 



Measurements (iyi millimeters). 



Length of Length of Width of Length of Width of 

 cf body pronotum pronotum tegmen teginen 



Carcarana, type 10 2.9 3.7 10.3 3 



Carcarana, paratype 2.7 3.9 2.1 1.8 



Rosario, paratype 11.3 2.9 3.8 10.3 3.1 



Buenos Aires, paratype 9.6 2.8 4 1.9 1.9 



Buenos Aires, paratype 10.4 3 4.2 2.1 1.85 



9 



Buenos Aires, allotype 12.8 3.6 4.9 2.3 2 



Buenos Aires, paratype 11.3 3.3 4.4 2 1.7 



Specimens Examined: 13; 5 males, 2 females and 6 immature in- 

 dividuals. ^^ 



^2 Two immature individuals from Montevideo, Uruguay, are before us, which 

 represent this or a very closely related species. They differ from the Carcarana 

 juveniles in having the limbs almost unicolorus, the tibiae distad and the tarsi 

 being only slightly less dark than the other portions, which are black. 



