372 STUDIES IN THE ISCHNOPTERITES (oRTHOPTERa) 



XestohlaUa, near or the same as the species later described by 

 Griff].ni as festae. 



No other species in the hterature can be referred without ques- 

 tion to the present genus.^^ 



Genotype. — XestohlaUa carrikeri new species. 



Generic Description. — Structure robust. Head broad for the 

 group. Pronotum proportionately broader than in I schnojAera 

 or Symploce, with disk smooth and evenly convex without sulci, 

 latero-caudal angles situated at caudal margin, which is weakly 

 obtuse-angulate produced with broadly rounded apex mesad. 

 Tegmina and wings fully developed.^^ Tegmina with discoidal 

 sectors (these including the branch of discoidal, median and ulnar 

 veins and their branches; the ulnar vein not showing as many 

 branches as the median vein) longitudinal. Wings with area be- 

 tween discoidal vein and anterior margin broad, decidedly broader 

 than in Ischnoptera or Symploce, the width greatest a little distad of 

 the mesal point, this area heavily suffused but with costal veins not 

 enlarged. Mediastine vein extending slightly more than half the 

 distance to the apex of the wing, from which vein spring a number 

 of the costal veins. Discoidal vein conspicuously forked mesad, 

 with succeeding irregular but decided furcations. ^^ Numerous 

 weak perpendicular veinlets connect the discoidal and median 

 veins. Ulnar vein distinctly curved, with few (0-3 to 5) incom- 

 plete proximal rami and generally more (1-2 to 5) distal rami ex- 

 tending to the margin of the wing.^° Intercalated triangle large 

 and distinct, larger than in any other genus of the Ischnopterites. 

 Median segment of males not, or but little, specialized. Dorsal 

 surface of male abdomen with disto-lateral angles of sixth segment 

 moderately or greatly produced, or with median area specialized. 

 Male supra-anal plate little produced with brief meso-distal por- 

 tion subchitinous to different degrees. Male subgenital plate 



^" Saussure's Ischnoptera peruana, described in 1862, may possibly be a 

 member of this or a closely allied genus. The description does not give suffi- 

 cient characters to place the species, though it is clearly not a member of 

 Ischnoptera. 



^* These are much more elongate in the male than in the female of carriken 

 and/estoe, but of subequal length in nycliboroides and hamata. 



^' In specimens with more elongate wings, the number of forks of the dis- 

 coidal vein is greater. 



"" The consideralile diff(>rences here apparently due to the differences in 

 wing length. 



