58 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVII. 



Key to the subgenera of Microtds. 

 A. — Pattern of lower anterior molar with some triangles closed 

 a. MamniEe 2 — 2 = 8. 

 a\ Palate normal. 



a^ Claws small, those on forefeet 



always shortest .. . ... ... I. MiCROTUS. 



6^ Claw^s large, those on forefeet 



nsually longest .... ... II. Phaiomys. 



6\ Palate abnormal, ending in a broad 

 median plate, cut off from the maxil- 

 laries on both sides... ... ... III. Alticola. 



h. Mammae 0-2=4 ... ... ... IV. Hyperacrius. 



B. — Pattern of lower anterior molar with all V. EoTHENOMYS. 

 triangles open. 



Subgenus I. — MiCROTUS. 

 No. 306. sikimensis, Hodgs. The only species recorded from our 



area. 

 Distribution : — 



M. (M.). sikimensis, Hors- Type locality : — Sikkim. (Hodgson), 

 field. Other localities: — Sikkim (Hodgson); 



Kalapokhi-i, Darjiling (B. M.), Sikkim 

 (M. S. I.) 



Tyj)e:—B. M. No. 79.11.21.397. 



Subgenus II. — Phaiomys. 



AT one 7 7 ,7 • -D1 r Bonhote described a species. 



No. 305. blytm, Blanf. 7^ • r n r i • i t 



^ waltom, irom Lhassa, 01 which 1 



named a subspecies petulans, (J. B. N. H. S., xx, p. 931, 1911), 



on specimens taken bj?^ Captain C. H. T. Whitehead. This form 



may be distinguished from blythi as follows : — 



Key to the forms of Phaiomys. 



A. — General colour drab ... ... ...1. blythi, Blanf. 



B. — General colour sepia ... ... ...2. waltoni petulans,Wr. 



Distribution : — 



1. M. (P.) blythi, Blanford. Type locality .■— Tsomoriri, 14,000', 



Western Ladak. (Theobald). 

 Other localities .-—Thibet (B. M.). 

 Type : — Ind. Mus. Calc. No. a. 

 {TjTpe oi leucurus, Blyth, Ind. Mus. 

 , . Calc. No. a.). 



2. M. {P.) waltonipetulans. Type locality : — Teza, Upper Sutlej 



Wroughton: Valley. (Captain C. H. T. Whitehead). 



Other localities :— Upper Sutlej' Val- 

 ley (B.M.). 

 : Type:— B. 11.-^0.10.12.2.27. 



