MORGAN HEBARD 383 



Explanation of diagram of wing in Xestoblatta. 

 C. M. Costal Margin. 



C. Costal Veins. These are simple, not clubbed, in the species of the 



Group Ischnopterites, the proximal costal veins springing from the 

 Mediastine Vein. 



I. T. Intercalated Triangle. Weakly indicated in the majority of species 

 of the Group Ischnopterites, this area .shows its greatest development 

 in Xestoblatta of the knowTi genera. 



M. Median Vein. This vein very rarely divides distad as shown. Nor- 

 mally undivided in the Group Ischnojiterites, such inconspicuous 

 distal division as here figured is attributable to individual variation 

 onh'. In this portion of the wing, similar individual variation in 

 the adjacent veins is frequently found. 



Ax. Axillary Vein. 



A. Anal Vein. This vein becomes subobsolete at the ai)ex of the Inter- 



calated Triangle. 



F. D. Fork of Discoidal "\'ein. Characteristic of Xestoblatta and Symploce. 



D. Discoidal Vein. The branches of the distal divisions of this vein are 



heavier and more striking in Xestoblatta than in Symploce; in that 

 genus, the arms of the first fork alone are equally heavy and con- 

 spicuous. 



U. Ulnar ^'ein. The number of rami of this vein is greatly reduced in 

 individuals of Xestoblatta showing wing reduction. 



Ms. Mediastine Vein. 



P. Peripheral IMargin. Into which run; the Axillary' ^"ein, its rami and 



the Radiate Veins. 



R. Radiate Veins. 



-Xestoblatta carrikeri new species, cf , tiipe. Santa Marta, Colom- 

 bia. Caudal view of portion of subgenital plate showing spe- 

 cialized styles. 



-Xestoblatta carrikeri new species, d', type. Dorsal view of distal 

 portion of abdomen. A. Depressed median specialization of 

 sixth dorsal abdominal segment. 



-Xestoblatta festae {Griffini) . cf. Rio ^lachuca, Costa Rica. Dor- 

 sal view of sinistral speciaUzed stj-le. 



-Xestoblatta festae (Griffini). cT. Rio Machuca, Costa Rica. 

 Caudal view of sinistral specialized style and sinistral margin of 

 subgenital plate, showing the armament of that margin. ( X 3) 



-Xestoblatta festae (Griffini). d'. Rio Machuca, Costa Rica. 

 Caudal view of dextral specialized style. 



-Xestoblatta festae {Griffini). cf. Rio Machuca, Costa Rica. Dor- 

 sal view of distal portion of abdomen. A. Latero-caudal produc- 

 tion of sixth dorsal abdominal segment. ( X 3) 



TRANS. AM. EXT. SOC, XLII. 



