Merriam New Chipmunks from Colorado and Arizona. 165 



Characters. Similar to amcenus but lacking the distinct black on anterior 

 two-thirds of posterior aspect of ear ; lower dark cheek stripe and stripe be 

 tween eye and ear usually narrower ; tail longer; upper side of tail more 

 strongly fulvous, the underlying black less marked ; underside of tail with 

 submarginal black band narrower ; median dorsal stripe blacker and more 

 pronounced on back of neck and occiput ; outer lateral stripe more pro 

 nounced. 



In the late fall pelage, which lasts until the breeding season, the rump 

 and middle pair of dorsal light bands are gray, as in amcenns, but in post- 

 breeding pelage the rump is more olivaceous, more or less grizzled with 

 fulvous; the middle pair of pale dorsal stripes are less gray, and the 

 shoulders and anterior part of back more deeply and extensively fulvous. 

 Some specimens in postbreeding pelage have the underparts suffused with 

 yellowish and fulvous as in the larger luteiventrix. 



Measurement* (taken in flesh). Type specimen : Total length, 200; tail 

 vertebrae, 93 ; hind foot, 31 . Average of 10 specimens from Estes Park, Colo 

 rado: Total length, 199 ; tail vertebrae, 92; hind foot, 31. 



Eutamias hopiensis sp. nov. 



Type from Ream Canyon, Painted Desert, Arizona. No. 67,768, 9 adult, 

 U. S. National Museum, Biological Survey Collection. July 27, 1894. A. K. 

 Fisher. Original No. 1688. 



Characters. Size medium or rather large, as in yuadrivitlatus ; general 

 color pale golden fulvous, particularly in winter pelage when even the dark 

 stripes are only slightly deeper fulvous than the flanks; head and rump 

 pale. 



Co/or. Topof head pale buffy gray, slightly darker in postbreeding pelage . 

 rump, pale grizzled ochraceous gray, only slightly darker in postbreeding 

 pelage ; outer pair of light stripes white ; inner pair of light stripes grizzled 

 white and gray, sometimes tinged with buffy ; dark dorsal stripes in winter 

 bright fulvous, in summer with black centers; tail deep rufous, the under 

 lying black showing through from above ; under side with black submarg 

 inal band rather narrow. 



Measurements. Average of 10 specimens from type locality measured in 

 flesh : Total length, 224 ; tail vertebrae, 101 ; hind foot, 33.5. 



Remarks. Dr. Fisher collected a fine series of this remarkably handsome 

 chipmunk in the juniper and pinyon belt at Keam Canyon, where it was 

 living among rocks and cliffs. He tells me that its name in the language 

 of the Hopi (or " Moki ") Indians is Koicena. The Biological Survey has 

 specimens also from Bluff City, Utah, collected by ,7. Alden Loring. The 

 species has been previously referred to gracilis a very different animal and 

 one which proves to be hardly distinguishable from true quadrivittatus of 

 Colorado. 



