NO. 2057. THE GRASSHOPPER MICE—HOLLISTER. 463 



blends directly into ramona in the western end of San Gorgonio Pass, 

 and probably intergrades with tularensis in the vicinity of Kern Kiver 

 Valley and Walker Pass. The single specimen from Onyx, on the 

 south fork of the Kern River, is rather immature, and is indistin- 

 guishable from examples of tularensis from the lower levels in the San 

 Joaquin Valley. Two young examples in the collection of the 

 Museum of Vertebrate Zoology at the University of California, from 

 Walker Pass, are likewise indistinguishable from specimens of the 

 same age from the San Joaquin Valley, and are only provisionally 

 on purely geographical grounds, and perhaps wrongly, placed with 

 pulcher. Adults from this pass are much needed to determine the 

 subspecies. The young of these forms, in post-juvenile pelage, are 

 often very much alike. 



Specimens examined. — Total number, 70, from the following locali- 

 ties : 



California: Agua Caliente, 1 (Amer. Mus.); Burns Canon, San 

 Bernardino Mountains, 2 (Field Mus.); Cabazon, 9; Cushenbury 

 Springs, 2 (Univ. of Cal.) ; Daggett, 1 (Field Mus.); Fairmont, 3 

 (Univ. of Cal.); Granite Springs, 1; Lane's Mill, 20 miles north of 

 Daggett, 1 (Field Mus.); Morongo Pass, 7^; Needles, 3; Onyx, 1; 

 Oro Grande, 2; Palm Springs, 2 (Mus. Comp. Zool.); Victorville, 18; 

 Walker Pass, 2 (Univ. of Cal.); Warren's Well, San Bernardino 

 Mountains, 1 (Field Mus.) ; Whitewater, 13. 



Lower California: Seven Wells, 1. 



ONYCHOMYS TORRIDUS LONGICATTDTJS Merrlam. 



1889. Onychomys longicaudus Merriam, North. Amer. Fauna, No. 2, p. 2. Octo- 

 ber 30. 



1893. 0[nychomys] longicauda Rhoads, Amer. Nat., vol. 27, p. 833. September. 



1904. 0[nychomys] torridus longicaudus Merriam, Proc. Biol. Soc. Washington, 

 vol. 17, p. 123. June 9. 



1913. Onychomys torridus longicaudus Hollister, Proc. Biol. Soc. Washington, 

 vol. 26, p. 215. December 20. 



Type-locality. — St. George, Utah. 



Geographic distribution. — Southwestern Utah, northwestern Arizona 

 north of the Colorado River, southern Nevada, and the adjacent 

 desert mountain region of Inyo and Mono Counties, California. 

 North in western Nevada to Carson Sink; west in Cahfornia to Kear- 

 sarge Pass and to the Argus Mountains. 



General characters. — Coloration like that of pulcher, but slightly 

 darker. Larger than perpallidus, with shorter tail and hind foot, 

 and smaller ear. Skull with, anterior palatine foramina short, usually 

 not reaching plane of front of first molars. Posterior edge of palate 

 truncate, rarely slightly convex, never with spine. 



1 Including the type and four paratypes from the Field Museum of Natural History, Chicago. 



