160 ORTHOPTEROUS GROUP INSARAE 



about. The nymphs taken September 15 and 16 on the Franklin 

 Mountains are in the second instar preceding maturity, while the 

 other nymphs, taken August 29 to September 11, are in the first 

 instar preceding maturity. As the specimen from one of the high- 

 est elevations (6750 feet) is that taken on August 29, and the Sep- 

 tember 15 to 16 individuals are from the lowest locality for the 

 species, it would seem that altitude has little or no effect on the 

 date of development. 



Morphological Notes. — The fastigium in both sexes exhibits con- 

 siderable variation in the amount of compression, the margins 

 regularly diverging caudad or being subparallel. The pronotum 

 shows some variation in the amount of bullation laterad, but this 

 is not very decided. The caudal margin of the pronotal disk is 

 regularly rounded in certain males and roundly obtuse-angulate 

 in others. In the male sex the number of rami of the discoidal 

 vein varies from three to four, three specimens having 3-3, five 

 having 3^ and five having 4-4. In the female sex one individual 

 has these rami 3^, three have them 4-4 and one bears 5-5. The 

 proximo-dorsal abdomiAal segment of the male sex has a distinct 

 disto-dorsal process in the specimens from .the Mesilla Valley and 

 the Franklin Mountains, but the males from the other more south- 

 ern localities have no trace of this process. There is an appreciable 

 amount of variation in the width of the distal margin of the male 

 subgenital plate, this margin being more frequently subtruncate 

 than subarcuate-emarginate. 



Synonymy. — The specimen recorded as A. constricta by Scudder 

 and Cockerell from Mesilla Valley near the Organ Mountains, is 

 now before us, so we are able to properly associate it with the 

 material collected by us in western Texas. 



Remarks. — The present species has certain peculiarities and 

 combinations of peculiarities not found in any of the other forms 

 of the genus. The combination of short tegmina and wings in the 

 female and ample stridulating field of the male tegmina are the 

 striking features of the species, as all of the other forms having 

 short tegmina and wings in the female have the stridulating field 

 of the male shorter, with the apex of the stridulating vein consider- 

 ably or greatly produced. The regular and non-crenulate ab- 

 dominal segments, taken in company with the above characters, 

 enable one readily to recognize the species. 



