SCUDDER. — THE GROUP SCUDDERI^. 273 



rounded, and the cleft between them distinct, deep, and parallel, or 

 almost parallel ; in another the lobes become laterally expanded flattened 

 flanges, separated by a moderately deep rectangular or subrectangular 

 emargination ; in the third, the lateral flanges are vertical, being com- 

 pressed instead of depressed, and are widely separated by a moderately 

 deej) but abrupt and wide apical emargination, the base of which is 

 broadly transverse and has a minute median projection ; in this group 

 the process completely embraces laterally the upturned subgenital plate, 

 although the latter is exceptionally broad, and not, as in the other types, 

 more or less strongly compressed apically ; finally, in a fourth group, the 

 segment is not produced at all, and the species which fall under it 

 are very diverse in the structure of the subgenital plate, which is other- 

 wise very similar throughout the genus. 



These distinctions have been used as the basis of the separation of the 

 males of this genus in the following table : — 



Table of the species of Scudderia, based upon the mcde. 



a^. Anal segment expanded apically into a pistillate process ; subgenital 

 jjlate strongly compressed apically, though more or less depressed basally ; 

 cerci relatively short and more or less strongly incurved. 



b^. Anal segment apically truncate with a minute median projection 

 and compressed, completely vertical, lateral flanges, which project 

 beyond the main body posteriorly, and so completely embrace and 

 generally extend beyond the sides of the subgenital plate when in 



natural position 1. texensis. 



b'^. Produced claviform or pistillate apical portion of anal segment, 

 as seen from above, generally considerably expanded and always 

 deeply and narrowly or distinctly and angularly emarginate at apex, 

 with no median projection, the lateral lobes touching only and not 

 fully embracing the sides of the subgenital plate when in place, and 

 never surpassing it. 



c\ Anal segment subrectangularly emarginate at apex, the lateral 

 lobes depressed, laterally expanded, laminate. 



d^. Tegmina much broader than depth of body and relatively 

 short, at most not much over four times longer than middle 

 breadth, the principal vein distinctly flexuous ; apical flanges of 

 anal segment subtriangular, distinctly tapering . 2. pistillata. 

 d\ Tegmina no broader than depth of body and relatively long, 

 nearly or more than five times longer than middle breadth, the 

 principal vein nearly-straight; apical Hanges of anal segment well 

 rounded, subequal in breadth. 



