272 PROCEEDINGS OF THE AMERICAN ACADEMY. 



b^. Fore and middle femora unarmed beneath, the hind femora either 

 unarmed or with few aud inconspicuous spines beneath ; subgenital 

 plate of male long, slender, apically V-shaped in cross section and with 



few exceptions apically compressed Scudderia. 



6^. All the femora distinctly spinulose beneath ; subgenital plate of 

 male short and broad, apically with a broad rounded emargination. 



Symmetropleura. 

 c^. Fastigium of vertex between the antennae nearly as broad as the 

 basal antennal joint ; mesosternum about twice as broad as long ; tegmina 

 and wings of equal length, not surpassing the hind femora ; tegmina 

 hardly more than three times as long as broad, the tympanum of male 

 but little longer than broad with very arcuate sides and crossed by a pair 

 of stout veins ; genicular lobes of hind femora armed apically with a pair 

 of minute spines Plutylyra. 



Scudderia Stal. 



Scudderia Stal, Ofv. k. Vet.-Akad. Forh., XXX., 41 (1873) ; Rec. 

 Orth., II., 14 (1874). 



This genus, which combines a very narrow fastigium between the eyes 

 with fore and middle femora unarmed beneath, has for its most striking 

 feature the peculiar armature of the male abdomen, which, however, is 

 greatly modified in two of the species ; it consists in the highly developed 

 structure of the anal segment, which is greatly produced, bearing a pis- 

 tillate, more or less decurved process, and this bears beneath at base a 

 compressed, depending, securiform lamina, and at tip is forked or notched 

 to receive and partially embrace the apical portion of the long, tapering, 

 upcurved, subgenital plate. 



The genus is confined to North America, where it is widely distributed 

 from the central portions of Central America to Canada, but appears to 

 be quite absent from the Antilles. In Brunner's first monograph of 

 the PhaneropterinjB, certain South American forms were placed with the 

 North American, but in his supplement to that work he has separated 

 them. One species, however, occurs in Panama. The number of spe- 

 cies is not great, less than a dozen being known, but they have been fre- 

 quently confused and are sometimes difficult to separate, especially the 

 females. 



As regards the structure of the anal segment of the male, the species 

 of Scudderia show four main types, according to which they may he 

 grouped. In one, the expanded apical portion is shaped somewhat (in 

 one species remarkably) like an ox-hoof, the lobes tumid and apically 



