272 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



than the more uniformly colored males. As a result, there is a color 

 contrast between the sexes, a condition which does not occur in 

 rufa. In the maximum intensive female (Carcarana) the vertex 

 to below the ocelli is rich deep chestnut brown. The pronotum is 

 similarly colored, becoming almost black in the mesal portion. The 

 tegmina are ochraceous -tawny, weakly suffused with chestnut brown 

 proximad, with marginal field buckthorn brown showing a weak 

 tawny tinge. 



Specimens Examined 19; 7 males and 12 females. 



Paraguay, 1 cf, [Hebard Cln.]. 



Colonia Florencia, Rio Tapenaga, Chaco, Argentina, 1 cf , [Paris 

 Museum]. 



San Nicolas, Buenos Aires, Argentina, November 5, 1897, 4 cf , 

 11 9 , type, allotype, paratypes, [Hebard Cln.]. 



Carcarana, Santa Fe, Argentina, 1 cf, 2 9, (1 with ootheca), 

 [Hebard Cln.]. 



Icano, Santiago del Estero, 1 9 , jParis Museum]. 



Cordoba, Cordoba, Argentina, (F. Schulz), 1 d^, [Hebard Cln.]. 



Ischnoptera bilunata Saussure. 



1869. I[schnoptera] bilunata Saussure, Rev. et Mag. de Zool., (2), XXI, p. 

 111. id"; Chiquitos, [Bolivia].] 



Sapucay, Paraguay, February 10, 1901, (W. T. Foster), 1 cf ,°^ 

 [U. S. N. M. ]. 



Gran Chaco, Argentina, 2 9 , [Paris Museum]. 



Colonia Florencia, Rio Tapenaga, Chaco Argentina, 1 d^ , 1 9 > 

 [Paris Museum.]. 



La Palisa del Bracho, Laguna Mamaita, Santiago del Estero, 

 1 (^, 19, [Paris Museum]. 



Troncal, Santiago del Estero, 1 9 , [Paris Museum]. 



Icano, Santiago del Estero, 1 d^, 1 9,1 juv. cf , [Paris Museum]. 



Las Garzas, Rio Las Garzas, Santa Fe, Argentina, 2 9 , [Paris 

 Museum]. 



Carcarana, Santa Fe, Argentina, 4 cf, 1 9 , [Hebard Cln.]. 



Comparison has been made with a specimen from Santa Cruz, 

 Bolivia, in the Academy collection. 



ischnoptera litostylata new species. Plate XI, figures 7 and 8. 



This diminutive species would appear to be a paler and smaller 

 type, related to I. saussurei and /. icano here described. Closer ex- 

 amination shows, however, that it belongs to a distinct phylum of 



9^ Bearing label ^'Blattella germanica, 9 " and so recorded by Caudell, Jour, 

 N. Y. Ent. Soc. , XII, p. 183, (1904). 



