REHN AND HEBARD 



103 



These groups might be generally characterized as follows : 



{arachnopyga 

 gracilipes 

 gradlipes constrida 



\ insaroides 



Angulate but not decidedl}' 

 produced apex to stridulat- 

 ing vein of male tegmina. 

 Cerci of male with distal ex- 

 tremity bent. Abdominal 

 segments of both sexes hav- 

 ing non-crenulate margins. 

 Female never decidedly bra- 

 chypterous. 

 ] Apex of stridulating vein of male teg- 



Group B. 



Group C. 



I phalanghmi 

 I grallator 

 [ semialata 



mina not angulate, rounded. Cerci 

 of male with distal extremity bent. 

 Abdominal segments of both sexes 

 having non-crenulate margins. Fe- 

 male never decidedly brachypterous. 

 f carita ] Apex of stridulating vein of male teg- 

 <j hrevicauda ^ mina decidedly produced, progres- 

 [ limijera J sively developing into an elongate 

 peg-like process. Cerci of male with 

 distal extremity not bent. Abdomi- 

 nal segments of both sexes having de- 

 cidedly crenulate or non-crenulate 

 margins. Female decidedl}^ brach- 

 ypterous. 

 ^ T^ [ , 1 Apex of stridulating vein of male tegmina 



Group D. \phantasma | ^^^ decidedly produced. Cerci of male 



with distal extremity bent. Abdom- 

 inal segments of both sexes having 

 decidedly crenulate margins. Female 

 macropterous. (Form of pronotum, 

 stridulating field of male tegmina, tex- 

 ture of pronotum and tegmina and 

 coloration distinctive.) 



Group A has a divergent form in arachnopyga which is strik- 

 ingly specialized in the male sex, the form of the supra-anal plate 

 and the disto-dorsal abdominal segment being unique in the genus, 

 the female also showing specialization m tegminal length which, 



TRANS. AM. ENT. SOC, XL. 



