ANTELIOMYS 299 



Cheek-teeth as in other species. 



Geographical differentiation. — Two subspecies, viz., the typical 

 form from the neighbourhood of A-tun-tsi, and A. c. rubelius 

 Allen from the Li-chiang Range further south, are at present 

 recognized. These forms are distinguished by slight differences 

 of colour. 



3a. Anteliomys custos custos Thomas. 

 1912. Microtus [Anteliomys) custos Thomas, Ann. Mag. N.H., [8], 9, 

 p. 517; Thomas, Ann. Mag. N.H., [8], 14, 1914, p. 474; G. M. 

 Allen, Araer. Mus. Nov., No. 133, 1924, p. 5. 



Type.—BM., No. 12.3.18.19; adult male, collected May 28, 

 1911, by F. Kingdon Ward, and presented by the Duke of Bedford. 



Type locality. — A-tun-tsi, North-Western Yunnan. Altitude 

 11,500-12,500 feet. 



Range. — Mountains of North-Western Yiinnan, at altitudes 

 of from 9000-13,000 feet. 



Characters. — Hind-foot 17 mm. ; condylo-basal length 25 mm. 



General colour above rather warmer than " broccoli brown " ; 

 head more greyish brown. Under surface paler brown, the hairs 

 of the belly washed with wood brown, but those of the throat, 

 chest, and axilla with greyish tips. Ears brown, like the back. 

 Hands and feet greyish-white above. Tail dark brown above, 

 greyish below. 



Skull with nasals ending posteriorly between and noticeably 

 in advance of the ends of the ascending branches of the pre- 

 maxillaries. 



For external and cranial dimensions, see tables at end of 

 volume. 



36. Anteliomys custos rubelius G. M. Allen. 

 1924. Microtus (Anteliomys) custos rubelius G. M. Allen, Amer. Mus. 

 Nov., No. 133, p. 5. 



Type. — American Mus. N.H., No. 44001 ; adult female, skin 

 and skull, collected October 13, 1916, by R. C. Andrews and 

 Edmund Heller. 



Type locality. — Ssu-shan (Snow Mountain), Li-chiang Range, 

 Yunnan. Altitude 13,000 feet, at timber line. 



Range. — Known only from the Li-chiang Range. 



Characters. — Similar in general to A. c. custos, but slightly 

 more reddish above, the belly clearer grey, lacking the decided 

 brownish wash, although sometimes with a very faint brownish 



the interorbital region broad, short, its edges rounded and its middle line 

 flat or concave, without tendency to form a median crest." As a result of 

 niy special studies of the Microtine skull, and after examination of all the 

 skulls of Anteliomys available, I am of opinion that neither the type nor 

 any of the other skulls of A. cusloa can be regarded as fully mature. 



