350 STUDIES IN THE ISCHNOPTERITES (oRTHOPTERA) 



Bartica, British Guiana, I, 7, 1913, (H. S. Parish), 1 9 , [A. N. S. P.]. 



Old Panama, Panama, XI, 13, 1913, (Hebard; under drift on edge of coral 

 sand beach), 1 cf , [Hebard Cln.]. 



Ancon, Canal Zone, Panama, (A. H. Jennings), 1 d', [U. S. N. M.]. 



Zone limit five miles west of Empire, Canal Zone, Panama, XI, 14, 1913, 

 (Hebard; under rubbish on edge of jungle), 1 cf , [Hebard Cln.]. 



Empire, Canal Zone, Panama, XI, 14, 1913; (under debris on edge of jungle), 

 1 juv. c?, [Hebard Chi.]. 



Gatun, Canal Zone, Panama, VII, 17 to VIII, 5, 1916, (D. E. Harrower), 

 1 cT, 2 9, [Hebard Cln.]. 



Ischnoptera rufa debilis new subspecies (Plate XVI, figs. 5 and 6.) 



The present geographic race evidently represents the response 

 in this species to high altitudes in Costa Rica. 



When compared with typical ruja, this race is found to differ 

 in average decidedly smaller size, decidedly reduced tegmina 

 and wings in both sexes, and more delicate male supra-anal 

 plate with distal transverse portion of free margin narrower. 



Type. — d^ ; Santa Maria de Dota, Costa Rica. Elevation 

 1600 meters. January, 1907. (J. F. Tristan.) [Acad. Nat. 

 Sci. Phila., Type no. 5306.] 



Description of Type. — Similar to ruja rufn, differing in the following features. 

 Size very small for the group. Ocelli with flattened surfaces slanting very 

 strongly mesad. Pronotum with caudal margin abruptly transverse.^^ Teg- 

 mina and wings decidedly reduced, leaving distal portion of abdomen, includ- 

 ing specialized segments,2o exposed. Supra-anal plate much as in typical 

 rufn but more delicate in structure, with transverse distal portion of free 

 margin narrower and with ventral surface supphed with fewer short, stout 

 bristles. Subgenital plate with angle at the dextral base of production weakly 

 obtuse angulate. 



Allotype. — 9 ; same data as type but taken in Januarj^, 1909. 

 [Acad. Nat. Sci. Phila.] 



Description of Allotype. — Agrees with male except in the following features. 

 Size somewhat larger, form slightly more robust. Head, as in typical rufa, 

 with interocular space slightly wider than interocellar space. Ocelli repre- 

 sented by rather weakly defined spots. Supra-anal plate triangularly i)ro- 

 duced, less than half as long as wide, with lateral margins weakly concave^i 

 and apex rather sharply rounded. Subgenital i)late as in rufa rufa. 



1' This condition appears to accompany tegniinal reduction frequently in 

 the Blattidae. We have already discussed this as found in Cariblatta lutca. 

 Trans. Am. Ent. Soc, xlii, p. 166, footnote 23, (1916). 



-" See generic description. 



2' This varies in the series l)efore us to a condition in which the lateral mar- 

 gins are very weaklj- convex from the cereal bases. 



