REHN AND HEBARD 113 



C. Limbs moderately elongate (caudal femora 22.8 mm. to 26.7). 

 Apical process of stridulating vein of male tegmina not as long 

 as the width of the remaining portion of the field; marginal 

 field of male tegmina moderately developed. Cerci of male 

 more robust. Abdominal segments of both sexes with mar- 

 gins not distinctly crenulate brevicauda (Sc udder) 



CC. Limbs greatly elongate (caudal femora 27.5 mm. to 30.6) . Api- 

 cal process of stridulating vein of tegmina subequal in length 

 to the width of the remaining portion of the field; marginal 

 field of male tegmina excessively developed. Cerci of male 

 slenderer. Abdominal segments with margins distinctly cren- 

 ulate. (Female unknown.) litnifera new species 



AA. Stridulating field of the male tegmina narrower proximad,. with its 



greatest breadth distinctly less than the length of the same area, or 



when very nearly subequal to the length the latter is decidedly less than 



that of the disk of the pronotura {gracilipes and arnchnopyga), apex of 



the stridulating vein not decidedly {i. e., peg-like) produced; tegmina of 



female at least twice as long as the pronotal disk. Cerci of male strongly 



bent inwards distad (except in occasional specimens of gracilipes). 



B. Supra-anal plate of male greatly developed, elongate subrectangu- 



late, deeply sulcate for the greater portion of its length and recessed 



into the disto-dorsal abdominal segment. (Female moderately 



brachypterous — see alternative with semiahitn.) 



arachnopyga new species cf 

 BB. Supra-anal plate of male normally developed, frequently trans- 

 verse, not deeply sulcate and never recessed into the disto-dorsal 

 abdominal segment. (Females macropterous or moderatel}'^ bra- 

 chypterous.) 



C. Cephalic and median femora with the disto-dorsal extremity 

 strongly compressed, angularly produced, subspiniform. Eyes 

 very elongate-elliptical, more than twice as deep as wide. 

 D. Size larger (tegmina, a" 28 to 32 mm., 9 30.5 to 34). Stridu- 

 lating field of the male tegmina shorter than the pronotal 

 disk; tegmina of both sexes somewhat broader at the dis- 

 tal fourth than at the proximal third. 

 * phalangium (Scudder) 



DD. Size smaller (tegmina, d" 20.7 to 26.5 mm., 9 23 to 29). 

 Stridulating field of the male tegmina subequal to the 

 length of the pronotal disk; tegmina of both sexes sub- 

 equal in width at the distal fourth and the proximal third. 



grallator (Scudder) 



CC. Cephalic and median femora with the disto-dorsal extremit}' 

 not at all or but little compressed, never angularly produced 

 or subspiniform. Eyes ovate, ovoid or elliptical, but never 

 twice as deep as wide. 



TRANS. AM. ENT. SOC, XL. 



