92 Proceedings of the Biological Society of Washington. 



bordered with fuscous black and edged with pinkish cinnamon ; same shades 

 above, but colors more intimately mixed and the blackish more prominent. 



Skull. — Closely similar to that of umbrinus, but avf raging slightly 

 larger; and broader across zygomata. 



Measurements. — Type (male adult) ; total length, 227 mm. ; tail vertebrae, 

 118; hind foot (dry) 33.8. Skull. — Occipito-nasal length, 35; zygomatic 

 breadth, 19.5; mastoidal breadth, 15.6; least interorbital breadth, 7.6; 

 length of nasals, 11.2. 



Remarks. — This handsome chipmunk is apparently a well-marked species, 

 belonging in the quadrivittatus-umbrinus group, but not at present known 

 to intergrade with umbrinus. It bears some resemblance to Eutamias 

 felix from the coast region of British Columbia, but may be distinguished 

 from that species by its whiter beUy, more reddish tail, more whitish 

 dorsal stripes, and larger skull with longer rostrum. 



The species is represented by a series of 26 specimens from the Glacier 

 Park region (St. Mary's Lake, Bear Creek, Summit, Paola, and Lake 

 McDonald) and 13 specimens from the Bitterroot Mountains (Florence, 

 Bass Creek, and mountains east of Corvallis). Nearly all are in unworn 

 winter pelage, the summer pelage being imperfectly known. Under the 

 name of "forest chipmunk," Bailey has described its habits and range in 

 the Glacier Park region.' 



I Bailey, Vernon, Wild Animals of Glacier National Park, 1918, p. 42. 



