168 ORTHOPTEROUS GROUP INSARAE 



that found in the type to one with the margins converging much as, 

 but to a less extent than, in the male. Pronotum of the male with 

 the cephalic margin of the disk varying from the type described 

 to arcuato-emarginate, while the caudal margin of the same is 

 rotundato-rectangulate in a few specimens of both sexes. The 

 number of rami of the discoidal vein varies from two to five in the 

 male sex, one specimen having 2-2, seven 3-3, five 3-4, two 4-4 

 and one 4-5. In the female sex one individual has 2-3 rami, one 

 3-3 and one 3-4. The usual spine on the genicular lobe of the 

 caudal femora is practically absent in the type, but indicated 

 in the other specimens. The male genitalia show little variation 

 aside from that frequently found in the distal margin of the sub- 

 genital plate, which is occasionally arcuato-emarginate instead of 

 truncate, and in the length of the stjdiform processes of the same. 



Synonymy. — That A. sellata represents the macropterous male 

 of the same species to which Scudder, on the basis of a brachyp- 

 terous female, gave the name carita, is evident to us after studying 

 the types and all the known material bearing on the question. At 

 the time A . sellata was described (and in fact to the present time) , 

 sexual dimorphism in wing length in this genus was unknown, and 

 in the two very different looking sexes of the present species there 

 is little in the way of general or superficial characters which would 

 associate them. However, certain of the more obscure characters, 

 as the structure of the abdominal segments, certain pronotal fea- 

 tures and details of the form of the head, enable us to place the 

 two in their proper relation. 



Remarks. — The present form is the least specialized of the group 

 of three species to which it belongs, the others {brevicauda and 

 limifera) representing more divergent developments along the 

 same lines. The sexual dimorphism is greater than in arachnopyga 

 and semialata, but less than in brevicauda, while the stridulating 

 field of the male tegmina in structure occupies a position between 

 gracilipes and arachnopyga on one hand and brevicauda and limifera 

 on the other. The form of the abdomen and appendages shows the 

 greatest relationship to be with brevicauda and limifera. 



Specimens Examined: 20; 17 d^, 3 9 . 



Mesilla Park, New Mexico, September 12, (Cockerell), 1 9 . Type. 

 [Scudder Collection] 



