CIRCOTETTIX.— HADBOTETTIX. 183 



CIRCOTETTIX, Scudder. 

 (Edipoda, auctt. (in part.). 

 Circotettix, Scudder, Bull. U.S. Geol. Surv. Terr. ii. p. 265 (1876). 



Circotettix is a northern genus that contains about a dozen species, only one of which 

 reaches Northern Mexico so far as known at the present time. These insects resemble 

 the Old- World genus Bryodema in their general structure. 



1. Circotettix UlldulatUS, Thomas. 

 (Edipoda undulata, Thom. Ann. Rep. U.S. Geol. Surv. v. p. 460 (1871) 1 ; Syn. Acrid. N. Am. 



pp. 125, 126 (1873) \ 

 Circotettix undulatus, Scudd. Bull. U.S. Geol. Surv. Terr. ii. p. 265 (1876) 3 ; Psyche, ix. p. 139 



(1900) 4 ; Rehn, Proc. Acad. Nat. Sci. Philad. 1902, p. 722 5 . 



Hal. Noeth America, from the plains of the Saskatchewan to Southern New 

 Mexico 1_5 . — Mexico, Northern Chihuahua (L. Bruner). 



This locust is partial to bare, more or less alkaline, ground, and for that reason is 

 found throughout the more arid regions wherever suitable localities occur. It is just 

 possible that Circotettix carlinianus, Thomas, will also be found in the same districts. 

 It differs from C. undulatus in being slightly more robust and in having the disc or 

 base of the wings fuliginous instead of yellow. 



HADROTETTIX, Scudder. 

 (Edipoda (in part.) . 

 Gryllus, Say (in part.) . 

 Hadrotettix, Scudder, Ann. Rep. Chief Eng. 1876, App. J J, p. 511. 



The locusts of this genus are confined to the Rocky Mountain regions and south- 

 westward, where they are to be met with on hill-tops and slopes in arid localities. 

 Two so-called species are represented, and may be separated as follows : — 



Table for separating the Species of Hadrotettix. 



A. Wings crossed by a broad fuscous band that follows the hind border 

 nearly to the anal angle. No taenia directed toward the base in the 



humeral field 1. trifasciatus, Say. 



AA. "Wings crossed by a rather narrow fuliginous band, not following the 



hind border far towards the anal angle 2. nebulosus, Scudd. 



T. nuUla, McNeill, loc. cit. p. 442. — New Mexico. 



T. variegata, McNeill, loc. cit. p. 443. — Southern California. 



T. alicims, Scudd. Proc. Dav. Acad. Nat. Sci. ix. p. 37, t. 2. fig. 1 (1902). — Organ Mts., New Mexico. 



T. cyanea, Scudd. loc. cit. p. 36, t. 2. fig. 3. — Organ Mts., New Mexico. 



T. rubripes, Rehn, Proc. Acad. Nat. Sci. Philad. 1904, p. 568. — Albuquerque, New Mexico. 



T. snowi, Rehn, Trans. Kans. Acad. Sci. 1 905, p. 223. — Yavapi County, Arizona. 



1. schaefferi, Caudell, Brooklyn Inst. Mus. Sci., Bull. i. p. 112, t. 7 (1904).— Texas. 



