128 ORTHOPTEROUS GROUP INSARAE 



a well developed process on the proximo-dorsal segment, this placed 

 mesad by the caudal margin and in the New Mexican specimens as 

 above described under the male sex, but in the west Texas and Ari- 

 zona individuals this process is lower, more trigonal when seen from 

 the side, not at all recurved or bulbous but just as decidedly erect 

 and sulcate caudad and always more apparent than in ^. gracilipes 

 constrida. The cerci of the male vary greatly in form, ranging from 

 a tapering type with the distal fourth bent incurved at a right angle 

 and with the apex very acute, to one with the recurved distal fourth 

 strongly depressed and lamellate, with the apex blunt acute but 

 marginal and not at all aciculate, and to another type with the dis- 

 tal fourth hardly at all curved, following much the same direction 

 as the main portion of the cercus and with the apex decidedly acicu- 

 late. The first type is by far the most numerous, occurring in the 

 New Mexico and Arizona specimens, the second in two males (all 

 seen) from western Texas, although suggested in another from Laluz, 

 south central New Mexico, the third only in Chihuahua material. 

 The study of a far larger series of specimens from that region of 

 which El Paso is the geographic center may show that these cereal 

 forms are characteristic of definite regions or elevations, and that 

 the recognition of more races would be advisable, but the present 

 day evidence is not sufficient to make any such deductions. The 

 sub-genital plate of the male shows very considerable variation in 

 the form and width of the distal emargination and in the length of 

 the styliform processes. The latter feature has no geographic sig- 

 nificance as far as we can determine, and we do not possess sufficient 

 series from single localities to make any statement regarding the 

 constancy of certain forms of the margin. The ovipositor of the 

 female shows some little variation in size but the form shows no 

 noteworthy differences. 



Synonymy. — From an examination of gracilipes and a study of 

 topotypes of constrida Brunner, it is evident that they are only 

 geographic forms of the same species. Brunner erroneously used 

 the name gracilipes for the very different species which Scudder 

 had previously named grallator. Of the records given for both of 

 the forms and based on specimens we have examined all but four, 

 two belonging to the present form. These are Thomas's 1872 

 record from northern Arizona and Scudder and Cockerell's La 



