March, 1906] CaUDELL : CyRTOPHVLLI OF THE UNITED STATES. 37 



sulcus and the posterior margin of the disk is more rounded, or some- 

 times subangulate. The anterior tibiae are unarmed above and the 

 posterior femorae are armed below on the outer carina with but four or 

 five spines, rarely six or seven. Supraanal plate in both sexes flat and 

 nonsulcate above or convex and longitudinally silicate only on the 

 basal fourth or less. Cerci of the male with the forks divergent, the 

 tips separated by a distance greater than the length of the lower 

 branch. Ovipositor more than twice as long as the pronotum. 



Type : Locusta perspicillata Fabricius. 



The distinctness of this genus from the preceding one is un- 

 doubted, the separating characters being ample to make easy the dif- 

 ferentiation of the two genera. Besides the characters enumerated 

 above the subgenital plate of the male is differently shaped, being 

 more hastate in Cyrtophyllus. The supraanal plate of the male of this 

 genus is also different, being about as broad as long, while in Paracyr- 

 tophyllus it is longer than broad. 



Brunner (Mon. Pseudophylliden) considers the genus Chloroccehis 

 of Bates a synonym of this genus. I very much doubt the correct- 

 ness of this view as the insect described by Bates does not seem con- 

 generic with the insect typical of Cyrtophyllus. 



We have four species belonging to this genus. They may be 

 separated by the following table : 



Cerci of the male with the lower branch simple. 



Lower branch of the cerci of the male with the incurving apical portion scarcely 

 as long as the less tapering basal portion ; the cerci between the two 

 branches less enlarged (Fig. 7); elytra of the female broadly rounded 

 apically and the posterior margin usually as convex as the costal margin 



(fig- 3)- 

 Larger ; transverse sulci of the pronotum distinct, usually quite conspicuous ; 

 elytra of the female less elongate than in the alternating category. 



perspicillatus. 

 Smaller ; transverse sulci of the pronotum less distinct, usually inconspicu- 

 ous ; elytra of the female distinctly more elongate than in the alternate 



category elongatus . 



Lower branch of the cerci of the male with the incurving apical portion as long 

 as the thick, uniformly tapering basal portion, the cerci between the two 

 branches much enlarged, forming a triangular projection (Fig. 8) ; elytra of 

 the female narrowly rounded apically, the posterior margin almost straight 



( Fig. 2 ) inter medius . 



Cerci of the male with the lower branch conspicuously forked (Fig. 9) furcatus. 



