284 BULLETIN •',(!, UNITED STATES NATIONAL MUSEUM. 



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

 appear t<> be an offshoot from the subgenus Ammospermophilus of 

 the genus Citellus; 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 lisht ones. 



Eutamias cinereicollis (p. 284). 

 Off. Dorsal stripes obsolete or obscure. 



h. Black restricted to the middle dorsal stripe. 



Eutamias dorsalis (p. 288). 

 1)J>. Black not restricted to the middle dorsal stripe. 



Eutamias merriami (p. 295). 



EUTAMIAS CINEREICOLLIS ( Allen). a 

 ARIZONA CHIPMUNK. 



Tamias cinereicollU Aulen, Bull. Am. Mus. Nat. Hist.. Ill, p. U4. June. 1890 



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

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



No. 1, Dec. L'T. 1901, p. 4(1 (Syst. Results Study X. Am. Mam. to .lose of 



1900). 

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



( Synop. Mam. X. Am.). 

 Yung-yi-uh of the llopi Indians of northeastern Arizona. 



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

 and skull, No. HHHHh 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 



o Mr. Vernon Bailey lias described the following subspecies: 

 Eutamias cinereicollis 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, I'.S.X.M. 



General character's. — Similar to cinereicollis in fresh postbreeding pelage, but 

 grayer throughout, with paler : ml duller ochraceous on sides; tips of the long 

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

 gray without. ;i tinge of yellowish; black dorsal stripe reaching forward to 

 between ears. 



Measurements. — Type: Total length 2.10 nun.; tail vertebrae lot; hind Cool 35. 

 Skull nf type: I'.asal 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.) 



