116 Proceedings of the Biological Society of Washington. 



the (lark clouding; second pale stripe essentially concolor with buffy 

 white of ear; region between pale stripes slightly darker and more brown- 

 ish than sides of body; feet light bnfF or huffy white, about concolor witii 

 inner pale dorsal stripe; hairs of tail brownish buff, those at sides and 

 on upper surface with black subterminal band (about 4 mm. ) and buffy 

 white tip, the under surface about concolor with crown though less tinged 

 with red; hairs at tip of tail black to extremities, but not forming a dark 

 pencil. 



Measurements. — Type, head and body, 123; tail, 88; hind foot, 31; 

 ear, 16; condylobasal length of skull, 32.0; zygomatic breadth, 21.8; 

 interorbital constriction, 12.2; breadth of braincase, 17.2; depth of 

 braincase, 12.8; nasal, 10.4; diastema, 7.8; mandible, 21.0; maxillary 

 toothrow (alveoli) 6.2; mandibular toothrow, 6.2. 



Remarks. — Its full, soft fur and pale colors at once distinguish the 

 boreal Tamiops vestitus from the austral members of the genus. In 

 general type of markings it agrees with T. hainamis (Allen), and so far 

 as can be judged from the descriptions, with T. maritimus (Bonhote) 

 and T. monticohis (Bonhote). 



