NO. 2057. THE GRASSHOPPER MICE^HOLLISTER. 459 



Government grass reserve, 30 miles south of Tucson, 1 (Univ. of 

 CaHf.). 



New Mexico: Alamogordo, 1 (Pliila. Acad. Sci.); Apache, Grant 

 County, 3 ; between Ahimogordo and Dry Canon, Sacramento Moun- 

 tams, 7 (Phila. Acad. Sci.); CarizaUilo Springs, 1; Dog Spring, 1; 

 Dry Creek, 1; Eddy, 2; Glen wood, 4; Gold Camp, 1; Hillsboro, 1; 

 Organ City, 1 ; Pleasanton, 4 ; lledrock, 2 ; San Andres Mountains, 1 ; 

 Silver City, 2; Socorro, 3; Tularosa, 10; upper corner monument, 

 Mexican boundary hne, 9; Weed, 1. 



Texas: Alpine, 5; El Paso, 1; Fort Lancaster, 6; Franklin Moun- 

 tains, 1 ; Kent, 1 ; Marathon, 1 ; Marf a, 9 ; Maxon Springs, 1 ; Mona- 

 hans, 4; Presidio County, 3; Rio Grande, 6 miles above El Paso, 1 

 (type of "arenicola"); Sierra Blanca, 11. 



Chihuahua: Casas Grandes, 5; Chihuahua, 2; Colonia Diaz, 1; 

 Gallego, 1; Juarez, 1 (Amer. Mus.); Mesquite Spnngs, 1; Samala- 

 yucp, 1. 



Sonora: Cerro Blanco, 1 (Field Mus.); Magdalena, 3. 



DuRANGo: Inde, 1; Rio Sestin, 2 (Amer. Mus.); Rosario, 1 (Amer. 

 Mus.); Villa Ocampo, 1 (Amer. Mus.). 



ONYCHOMYS TORRIDXIS PERPALLIDUS Mearns. 



1896. Onychomys torridus perpallidus Mearns, Proc. U. S. Nat. Mus., No. 1103, 

 advance sheet, p. 4, May 25; Proc. U. S. Nat. Mus., vol. 19, p. 140. 



Type-locality. — East bank of Colorado River, at Monument No. 

 204, Mexican Boundary Line, Yuma County, Arizona. 



Geographic distribution. — Colorado River valley in western Ari- 

 zona; eastward along tributary streams to Big Sandy Creek, Signal, 

 and Phoenix. Doubtless occurs also m northwestern Sonora. 



General characters. — Slightly larger than the neighboring . forms, 

 torridus, longicaudus, and pulcher, with larger ears. Coloration 

 much as in longicaudus, but averaging considerably duller, less 

 brightly pinkish-buff; paler than in' torridus, darker than in pulcher. 

 Skull always with well-developed spine from posterior edge of palate; 

 the anterior palatine foramina ending about even with plane of fronts 

 of fij-st molars. 



Color. — Adult in full winter pelage (189282, Dolan's Spring, Ari- 

 zona, February 7) : Decidedly paler, less richly colored, than corre- 

 sponding pelage of torridus. General color of upperparts light 

 pinldsh-cinnamon, pure on cheeks, shoulders, and sides, and very 

 sparingly and minutely streaked with darker on back and rump, 

 lanuginous tufts in front of ears mixed with color of head and much 

 less conspicuous than in torridus; underfur a much paler slate, in 

 most lights about as in slate-gray No. 5 .of Ridgway. Tail, feet, 

 and underparts as in torridus, but the underfur below very narrowly 

 pale slate, very different from the broadly grayish-black underfur 

 of torridus. Adult in late winter and spring (60174, type, Yuma 



