synaptomys, '257 



Wrangel's Lemming Vole. 



Type locality. Wrangel, Alaska. 



Geogr. Distr. Southwestern Alaska. Range unknown. 



624. Synaptomys andersoni Allen. 



Synaptomys andersoni Allen, Bull. Am. Mus. Nat. Hist. N. Y., 



1903. P- 554. 

 Anderson's Lemming Vole. 



Type locality. Level Mountain, northern British Columbia, 

 Canada. 



Geogr. Distr. British Columbia. Range unknown. 



Genl. Char. Skull similar to that of S. wrangeli, but bullae more- 

 inflated, especially anteriorly ; posterior loop of last upper molar about 

 two-thirds as large as the middle loop; reentrant angle on outer side 

 of last molar nearly as deep as that in similar tooth of S. truii. 



Color. Above dark brown varied with blackish and suffused with 

 clay color ; head and cheeks like back ; flanks yellowish brown ; under 

 surface ashy gray; tail with dorsal third blackish; sides and lower 

 surface dull grayish; upper surface of hands and feet blackish brown. 



Measurements. Total length, 120; tail vertebrae, 25; hind foot, 

 18; ear, 11.5. Skull: occipito-nasal length, 24.6; length of nasals, 23; 

 zygomatic width, 14.5; mastoid breadth, 11.5; interorbital constric- 

 tion, 3 ; length of braincase, 14 ; length of rostrum, 1 1 ; length of nasals, 

 6; length of incisive foramina, 4.2; length of upper tooth row, 6.6. 



625. Synaptomys chapmani Allen. 



Sj/naptomys chapmani Allen, Bull. Am. Mus. Nat. Hist. N. Y., 



1903. P- 555- 

 Chapman's Lemming Vole. 



Type locality. Glacier, Selkirk Range, British Columbia, Canada. 



Geogr. Distr. British Columbia. Range unknown. 



Genl. Char. Larger than 5. andersoni, and skull narrower; ros- 

 trum longer; incisive foramina longer and ' narrower, and bullae less 

 inflated. 



Color. Above grayish brown tinged with bufiF, strongest on the 

 head; beneath dark gray, base of fur plumbeous; feet grayish brown; 

 tail dark; side glands in front of hips covered with whitish fur. 



Measurements. Total length, 134; tail vertebrae, 21; hind foot^ 

 20; ear (from notch in dry skin), 11. Skull: occipito-nasal length, 

 26; basal length, 24.5; zygomatic breadth, 15.2; mastoid breadth, 

 H.5; interorbital constriction, 3; length of braincase, 13.5; length of 

 rostrum, 12.2; length of nasals, 6.6; length of palatal foramina, 5; 

 length of upper tooth row, 7 . 



