THE GRASSHOPPER MICE—HOLLISTER. 461 



from Needles, California, may not be typical of their respective 

 races, there is a decided break in size and m skull characters at 

 this point, and every specimen so far examined can be placed unhes- 

 itatingly with its proper form. On the west side of the Colorado, 

 at Needles, there is a decided reduction in size, accompanied by 

 absence of the palatal spine, and the skins are colored much more 

 like typical pulcher than true perpallidus. The specimens from east 

 of the river (Fort Mojave, Beale's Spring, and Big Sandy Creek), 

 are darker (slightly approaching typical longicaudus in color), but 

 exhibit the cranial characters of perpallidus. 



Specimens examined.— Total number, 21, from localities as follows: 



Arizona: Beale's Spring, 3; Big Sandy Creek, 2; Colorado River 



at Monument 204, Mexican Boundary Line, 1 (type) ; Dolan's Sprmg, 



1; Fort Mojave, 1; Gila City, 3; Harpers, 2; Parker, 1; Phoenix, 5; 



Signal, 1; Yuma, 1. 



ONYCHOMYS TORRID0S PULCHER ElUot. 



1903. Onychomys pulcher Elliot, Field C"ol. Mus., pub. 87, zool. ser., vol. 3, No. 14, 



p. 243. December. 

 1913. 0[nychomys] t[orridus] pulcher Hollister, Proc. Biol. Soc. Washington, 

 vol. 26, p. 215. December 20. 



Type-locality.— MoYongo Pass, San Bernardino Mountains, Cali- 

 fornia. 



Geographic distribution. — Mohave and Colorado Deserts, CaUfornia, 

 and Lower Cahfornia, Mexico, Known by specimens from Granite 

 Springs and Needles on the north to Seven Wells, Lower CaUfornia, on 

 the south ; and from the Colorado River bottoms westward to Ante- 

 lope Valley and through San Gorgonia Pass to Cabezon station. 



General characters.— Size smaWest in the genus. Coloration very pale, 

 with minimum amount of dark wash from the hair tips. Skull with 

 anterior palatine foramina about even with fronts of m* and with 

 tendency toward development of an imperfect spine at posterior edge 

 of palate. 



Color.— Adult in full winter pelage (151281, Morongo Pass, Cali- 

 fornia, November 23): Resembhng corresponding pelage of 0. t. 

 perpallidus but slightly paler, with less dark overwash from hair tips; 

 nose and head paler, more grayish; upper side of tail hghter grayish- 

 brown; and general coloration more pinkish-cinnamon; lanuginous 

 tufts at bases of ears white, sharply marked from general color of head. 

 Adult in spring and early summer (151640, Victorville, California, 

 April 5) : Brighter and purer pinkish-cinnamon than in early winter 

 coat, with still less dark from hair tips, evidently due to wear and 

 fading. Entire upperpartshghtochraceous-pinkish-cinnamon,slightly 

 darker on lower back and rump; nose and forehead paler, more 

 grayish; underparts pure white, the gray hair bases very narrow. 



