SCUDDER. — THE GROUP SCUDDERI^. 275 



gination somewhat less deep than in the alternate category, but 

 generally with parallel or subparallel sides. 



e^. Enlarged apical portion of anal segment broadest, when 

 viewed from above, at the middle of the apical emargination, 

 unicolorous, less pronounced, the arms of the fork less tapering, 

 as much compressed as depressed, with no prominent basal heel, 

 and hardly triangular as seen laterally . . . ^. furcifera. 

 e^. Enlarged apical portion of anal segment broadest, when 

 viewed from above, at the base of the apical emargination, 

 more or less infuscated, more pronounced, the arms of the fork 

 more tapering, more depressed than compressed, often con- 

 spicuously swollen at base and with a prominent basal heel, 

 and more or less triangular as seen laterally . . 9. furcata. 

 a^. Anal segment triangular or transversely quadrate with no apical 

 process ; subgenital plate depressed throughout ; cerci relatively long and 

 gently arcuate. 



b^. Anal segment triangular, apically angulate ; subgenital plate api- 

 cally incised to a depth less than the middle breadth of the plate, the 

 lobes divaricate ; cerci tapering, apically acuminate ; hind femora 

 spined beneath on inner margin only or not at all. 



10. septentrionalis. 

 P. Anal segment transversely quadrate, apically truncate ; subgenital 

 plate apically incised to half its length, forcipiform, the lobes oppo- 

 sitely arcuate ; cerci hardly tapering, apically bifid or biangulate ; hind 

 femora spined beneath on both margins 11. forcipata. 



The females of the species of Scudderia are relatively difficult to sep- 

 arate, as Saussure has already remarked. The following table for their 

 determination has therefore been constructed with much difficulty, and 

 will sometimes fail to prove entirely satisfactory. 



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



(The females of S. paronce Griff., and S. forcipata Brunn., are not 

 known.) 



a\ Ovipositor bent as well as curved, generally (excl. laticauda) dis- 

 tinctly less than half as long again as pronotum. 



h^. Disk of pronotum distinctly broadening from in front backward ; 



few or no spinules on the inner carina of underside of hind femora. 



c^ Disk of pronotum distinctly less than half as long again as its 



posterior breadth, distinctly dilating posteriorly; tegmina less than 



four times as long as broad 2. pistillata. 



