284 BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



Merriam, the western 4-striped chipmunks of the genus Eutamias 

 appear to be an offshoot from the subgenus AmmospermopMlus of 

 the genus Gitellus; while the restricted Tamias appears to have been 

 derived from Ictidomys. 



KEY TO THREE SPECIES OF THE GENUS EUTAMIAS. 



a. With five well-defined black dorsal stripes, separating four light ones. 



Eutamias cinereioolUs (p. 284). 

 aa. Dorsal stripes obsolete or obscure. 



1). Black restricted to the middle dorsal stripe. 



Eutamias dorsalis (p. 288). 

 66. Black not restricted to the middle dorsal stripe. 



Eutamias mcrriami (p. 295). 



EUTAMIAS CINEREICOLLIS (Allen), a 

 ARIZONA CHIPMUNK. 



Tamias cinereicollis Allen, Bull. Am. Mus. Nat. Hist, III, p. 94, June, 1890 



(original description) ; VII, 1895, p. 243. 

 Eutamias cinereicollis, Milleb and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, 



No. 1, Dec. 27, 1901, p. 40 (Syst. Results Study N. Am. JIam. to close of 



1900). 

 [Tamias^ cinereicollis, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 75 



(Synop. Mam. N. Am.). 

 yUng-yi-uh of the Hopi Indians of northeastern Arizona. 



■-Type-locality. — San Francisco Mountain, Arizona. (Type, skin, 

 and skull, No. i|||-J, U. S. National Museum, Biological Survey 

 Collection.) 



Geographical range. — Boreal zone of mountains of the Colorado 

 Plateau, in northeastern Arizona. 



Description. — Size medium; pelage full and soft; ears medium 

 size; dorsal surface with five plainly defined dark stripes and four 

 light ones of about equal breadth. The original description, by Dr. 

 J. A. Allen, based in part on our collection, reads as follows: 



Autumnal pelage (August and September). — General color above gray; sides 

 between shoulders and hips yellowish brown ; below grayish white ; nape, sides 



a Mr. Vernon Bailey has described the following subspecies : 

 Eutamias piiiereicollis canipes Bailey, Proc. Biol. Soc. Washington, XV, 

 , p. 117, June 2, 1902. 



Type-locality. — Gaudalupe Mountains, El Paso County, Texas. Altitude 7,000 

 feet. Type, Cat. No. 109229, U.S.N.M. 



General characters. — Similar to cinereicollis in fresh postbreeding pelage, but 

 Evayer throughout, with paler r.nd duller ochraceous on sides ; tips of the long 

 hairs on rump and upper surface of tall white instead of yellowish ; feet clear 

 gray without, a tinge of yellowish ; black dorsal stripe reaching forward to 

 between ears. 



Measurements. — Type : Total length 230 mm. ; tail vertebrae 104 ; hind foot 35. 

 SJcull of type : Basal length 30 ; nasals 11 ; zygomatic breadth 19.3 ; mastoid 

 breadth 15.8 ; alveolar length of upper molar series 5.8. (Proc. Biol. Soc, Wash., 

 XV, p. 117.) 



