278 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



in northeastern Sonora, Mexico, and the Huachuca .Mountains, 

 southern Arizona. 



Characters. — Similar to typical Sciurus arisonensis, but slightly 

 smaller, with a broad band of gray over back of neck and shoulders, 

 separating the median grizzled yellowish or pale rusty area into a 

 narrow patch on crown and ears, and a larger one on lumbar region 

 and rump. Mamma?: P. |, A. §, I. \. 



Color. — Mr. Nelson describes May specimens from the Huachuca 



Mountains. Arizona, as 

 follows : 



Upper parts, including top of 

 nose and base of tail, pale 

 grizzled gray with rusty yellow- 

 wash on hack of crown, lum- 

 bar region, and rump; sides of 

 neck, flanks, and outside of 

 hind legs somewhat paler than 

 top of shoulders: fore feet and 

 outside of legs grizzled gray- 

 ish white. sometimes pale 

 gray; hind feet pale grizzled 

 gray : ring around eye whitish, 

 or slightly huffy ; sides of 

 head whitish gray, often with 

 postocular yellowish brown 

 suffusion ; ears dingy grayish 

 or dull yellowish, sometimes 

 with small patch of dull gray 

 or rusty yellow behind base; 

 under parts white; tail above 

 black washed with white, 

 heaviest along border; below, 

 broad median area grizzled 

 rusty, dull orange yellow or 

 yellowish brown, with heavy 

 black border and broad white 

 edge. Hairs on hack black, 

 with white tips and broad yel- 

 low subbasal or basal rings, or 

 with subterminal huffy yellow 

 rings, mixed with other hairs wholly black. Winter pelage similar to that of 

 summer, hut a little grayer on sides of body and outside of legs and feet; ears 

 more thickly haired and dull rusty, with basal patches of same color: white 

 on tail more distinct. (Proc. Washington Acad. Sci., I. 1899, p. 96.) 



S/.-i/JJ. — Larger than typical Sciurus arkonensis, otherwise -mil- 

 iar; differs from S. ocalutus in having much smaller audita] bullae, 

 larger rostrum, more inflated parietals, with occiput higher and 

 narrower. Greatest length of skull (rig. 44). 63 mm.: greatest 

 breadth, 37; palatal length. 27.5; interorbital breath. 20. 



Fig. 44. — Sciurus akizonknsis huachuca. Huachuca 

 Mountains, Arizona. (Cat. No. 58966,U.S.N.M.) a. Dor- 

 sal VIEW; h, VENTRAL VIEW; 0, LATERAL VIEW. 



