352 STUDIES IN THE ISCHNOPTERITES (oRTHOPTERA) 



Specimens Examined: 15; 5 males and 10 females. 



Volcan Irazu, Costa Rica, II, 22, 1902, (L. Bruner), 1 9, [Hebard Cln.]. 



Pacavas, (Atlantic drainage), Costa Rica, 1430 meters. III, 1906, (P. Biol- 

 ley), 1 >, [A. N. S. P.]. 



Azahar de Cartage, Costa Rica, I, 1903, 1 d^, [Hebard Cln.]. 



El Tablazo, Costa Rica, 1900 meters, (J. F. Tristan), 2 9 , [A. N. S. P.]. 



Monte Redondo, Costa Rica, I, 1903, 1 d^, [Hebard Cln.]. 



Santa Maria de Dota, .Costa Rica, 1600 meters, I, 1907 and 1909, (J. F. 

 Tristan), 2 cT, 7 9, lijlpe, allotype, paratypes, [A. N. S. P.]. 



Ischnoptera rufa occidentalis Saussure (Plate XVI, fig. 7.) 



1862. I[schnoptera] occidentalis Saussure, Rev. et Mag. Zool., 2e Ser., XIV, 



p. 170. [New [Orleans, Louisiana].] 



1862. I[schnoplera] consohriiia Saussure, ibid., p. 170. [[Cordoba, Mexico.]] 



This geographic race can best be separated from typical rufa 

 by differences in the form of the male subgenital plate and by the 

 facial coloration, which in the present race is normally concolorous, 

 pale or dark, while in rufa rufa the area from the occiput to below 

 the ocelli is decidedly darker than the remaining portions. 



The material l^efore us shows great variation in size, develop- 

 ment of tegmina and wings and in coloration. These features, 

 to the extent found in the present series, are in part clearly due 

 to individual variation, but may also to some extent be attribu- 

 table to differences in elevation with the resultant decided envi- 

 ronmental changes. 



Characters of d". — (Vera Cruz, Mexico.) Similar to tj'pical rufa except in 

 the following features. Supra-anal plate with lateral margins very slightly 

 more convergent. Mesal production of subgenital plate more decided, its 

 dextral margin straight and forming nearly a right angle with the dextral 

 portion of the free margin of the plate, rather broadly transverse distad, with 

 dextral angle sharply rounded and rectangulate, sinistrad obUque to sinistral 

 style .22 Largest style shghtly dextrad of mesal point of production. 



The female sex agrees throughout with that of typical rufa 

 except in the cephalic coloration discussed above; similar de- 

 cided variability in the form of the supra-anal plate is shown. 

 Decided tegminal reduction is sometimes encountered, these 

 organs reach only to the apex of the supra-anal plate in a few 

 specimens (1, Atoyac, Mexico; 1, Costa Rica; 1, San Jose, Costa 

 Rica), and in one, only to the fifth dorsal abdominal segment 

 (San Jose, Costa Rica). 



-' The Costa Rican mal(\s have the disto-ihwtral :\ngl(> of the mesal ])roduc- 

 tion loss sharply rounded, th(> one from San Jose also has the angle at the dextral 

 base of the production weakly obtuse. These differences showing the condi- 

 tion nearly intermediate between the present race and tj'pioal rufa. 



