320 MICROTIN^ 



Range. — Known only from the type locality. 



Characters. — Like A. w. ivorthingtoni in all essential characters, 

 but the pure white of the end of the hairs of the lower surface 

 replaced by " pale pinkish buff " (Ridgway, 1912). Hands, feet, 

 and tail also with a slight buffy tinge. 



Skull and teeth as in ^. w. worthingtoni. 



For external and cranial measurements, see tables at end of 

 volume. 



9c. Alticola worthingtoni semicanus G. M. Allen. 

 1924. Microtus (Alticola) imrlhingloiii semicanus G. M. Allen, Amor. 

 Mus. Nov., No. 133, p. 6. 



T?/pc.— American Museum N.H., No. 57805 ; adult male, skin 

 and skull, collected June 5, 1922, by the Third Asiatic Expedition. 



Type locality. — Sain Noin Khan, Mongolia. 



/?«??^e.— Central Mongolia. Altitude 6000-7000 feet. 



Characters. — Hind-foot 19 mm. ; condylo-basal length 

 28-7 mm. 



General colour above buffy grey slightly darkened with scat- 

 tered black hairs. Sides of nose, front and back of ears nearly 

 " pinkish buff." Under parts buffy white, the hairs with dark 

 bases. The mixed grey of the back is sharply defined at the 

 sides of the head and body and the buii is here clearer and brighter, 

 forming an indistinct " pinkish buff " lateral line. 



Skull larger throughout than in typical form, with longer 

 tooth-rows; m^ with well-defined first outer infold; m-^ with 

 posterior loop, four completely closed triangles and an anterior 

 trefoil. 



For external and cranial measurements, see tables at end of 

 volume. 



Remarks. — Distinguished from the typical subspecies by its 

 buffy instead of clear white under surface and by its larger skull 

 and longer tooth-rows. 



10. Alticola stoliczkanus Blanford. 

 1875. Arvicola stoliczhamts 'SianiorA, J.A.S. Bengal, 44, pt. 2, p. 107; 



Sci. Res. Second Yarkand Mission, Mammalia, p. 42, pi. viii, fig. 1, 



pi. x6, fig. 2, 1879; J.A.S. Bengal, 50, pt. 2, p. 97, 1881 (section 



Alticola). 

 1881. Arvicola stoliczkana Thomas, Ann. Mag. N.H., [5], 6, p. 333. 

 1891. Arvicola [Alticola) stoliczkanus Sclater, Catal. Mamm. Ind. 



Mus., pt. 2, p. 89. 

 1891. Microtus stoliczkanus Blanford, Fauna Brit. India, Mamm., 



p. 430. 

 1896. Microtus {Alticola) stoliczkanus Miller, N. Amer. Fauna, No. 12, 



p. 52 ; Proc. Acad. Nat. Sci. Philadelphia, 1899, p. 292 ; Wroughton, 



" Summary," J. Bombay N.H.S., 27, 1920, p. 60. 



Co-types. — Indian Museum, Calcutta, Nos. a and b. Sclater 

 (Catal. Mamm. Ind. Mus., pt. 2, p. 89) gives the following 



