120 ORTHOPTEROUS GROUP INSARAE 



appears io be individual, but there exists a possibility of the Monte- 

 lovez specimen representing a form of which the male is at present 

 unknown. 



Remarks. — This species is apparently localized in distribution, 

 occurring only in suitable habitats, but how widely it ranges we 

 cannot even estimate, as the conditions wherein it was found at 

 Marathon were exceptional for western Texas in many respects. 



Specimens Examined: 6; 3 cf, 2 9, 1 immature 9 : 



Marathon, Brewster, Company, Texas, elevation 3900 to 4160 feet, Au- 

 gust 26 and 27 and September 12 and 13, 1912 (R. & H.), 3 cf , 1 9,1 imma- 

 ture 9. Type, allotype, paratypes. 



Montelovez, Coahuila, Mexico, 1 9, [Scudder Collection]. 



Arethaea gracilipes (Thomas) (Figs. 37, 38, 41, 51 and 62.) 



1870. Elphippilytha] gracilipes Thomas, Proc. Acad. Nat. Sci. Phila., 1870, 



p. 76. [Southern Colorado.] 



1871. Ephippitytha gracilipes Thomas, Prelim. Rep. U. S. Geol. Surv. 



Wyoming, pp. 265, 268. [Southern (page 268) or southeastern 

 (page 265) Colorado.] 



1872. Ephippitytha gracilipes Thomas, Prelim. Rep. U. S. Geol. Surv. Mon- 



tana, p. 445, pi. II, fig. 11. [Northern Arizona.] 

 1872. Ephippitytha gracilipes Glover, Illustr. N. Amer. Entom., Orth., pi. 



XI, fig. 11. 

 1900. [Arethaea] gracilipes Scudder, Proc. Davenp. Acad. Sci., VIII, p. 67. 



(Part.) [Colorado; Arizona.] 

 1902. Arethaea constricta Scudder and Cockerell (not of Brunner), Proc. 



Davenp. Acad. Sci., IX, p. 52. (Part.) [Ten miles west of La Luz, 



New Mexico.] 

 1902. Arethaea gracilipes Scudder and Cockerell, Ibid, p. 52. [La Tremen- 



tina. New Mexico.] 

 1904. Arethaea gracilipes Rehn, Proc. Acad. Nat. Sci. Phila., 1904, p. 542. 



[Casas Grandes, Chihuahua, Mexico.] 



1906. A[rethaea] gracilipes Kirby, Synon. Catal. Orth., II. p. 443. (Part.) 



[Colorado; Arizona.] 



1907. Arethaea constricta Rehn (not of Brunner), Ibid, 1907, p. 74. [Tuc- 



son, Arizona.] 

 1909. Arethaea constricta Rehn and Hebard (not of Brunner), Ibid, 1909, 

 p. 168. [Fort Wingate, New; Mexico.] 



The present species and its geographic race constricta stand so 

 much apart from the other forms of the genus that the characters 

 given in the Icey will readily differentiate them from the other 

 species. In many respects gracilipes constricta shows relationship 

 to the species-group B, while gracilipes sensu strictiore has a con- 



