378 



BULLETIN 56, UNITED STATES KTATIONAL MUSEUM. 



Measurements of type of Onychomys torridus arenicola. 



ONYCHOMYS TORRIDUS PERPALLIDUS Mearns. 

 YUUA GRASSHOPPER MOUSE. 



Onychomys torridus perpallidus Meaens, Proc. U. S. Nat. Mus., XIX, 1896, p. 140 (p. 4 

 of advance sheet issued May 25, 1896; original description). — Miller and Rehn, 

 Proc. Bost. See. Nat. Hist., XXX, No. 1, Dec. 27, 1901, p. 67 (Syst. Results Study 

 N. Am. Mammals to close of 1900). 



[OnyAdmys torridus] ■perpallidus, Elliot, Field Col. Mus.,Zool. Ser., II, 1901, p. 122 

 (Synop. Mam. N. Am.). 



Olnychomys] t[orridus] perpallidv^, Elliot, Field Col. Mus.,Zool. Ser., IV, 1904, pp. 

 165, 168 (Mam. Mid. Am,). 



Type-locality. ^-Jjeit (east) bank of the Colorado River, at Monu- 

 ment No. 204. (Type,, skin and skull, Cat. No. 60174, U. S. National 

 Museum.) 



Geographical range. — Lower Sonoran Zone of the Western Desert 

 Tract. 



Fig. 66.— Onychomys torridus perpallidus. Skull of type, a, Dorsal view; 6, Ventral view; 



c, Lateral view. 



Description.— Slightly larger than typical Onychomys torridus, with 

 relatively larger ears and longer tail, knd a much paler coloration. 

 Color above drab-gray, becoming more cinereous anteriorly; sides and 

 rump barely tinged with fawn color; dusky line -on basal three- 

 fourths of upper side of tail much obscured by whitish hairs; ears less 

 densely clothed than in the other subspecies of 0. torridus, and with- 

 out a well-defined dusky spot; whiskers mostly white or colorless; 



