58 SECOND YARKAND MISSION. 
having the tail longer than the body, and apparently in having a shorter head and 
hairy ears. Another form showing considerable resemblance is G. unguiculatus 1 ir ° ^ 
Chinese Mongolia, which, however, is represented as wanting the dusky tip to the tail) an 
as having the tail shorter than the body. This species agrees with G. cryptorhini is ^ 
having hairs on the soles of the fore-feet as well as on those of the hind, but the skuh 
more convex above, and has the prominent lachrymal process united to the frontal. 
the other Asiatic forms there are greater differences. From G. indicus 2 and G. per sicus ^ 
present species is distinguished by its hairy hind-feet and shorter head ; from G. erythri 
and G. hurriancc 5 by its very differently shaped and much longer head, its white ull< , 
surface, &c. ; and from G. pmmmophilus 6 by its much longer tail. It is, moreover, to the < )e ^ 
of my knowledge, distinguished from all the species named by the peculiar flap cover 111 " 
the nostrils. There is certainly nothing of the kind in G. indicus, G. persicus, G. hurri 
or G. nanus, nor can I find it described in any other species. ^ 
A Gerbillus 7 is described by Severtzoff from Western Turkestan under the name 
Meriones collium. It is said to he rufescent above, white below ; the hairs of the tail rl 
cent and black mixed ; the tuft at the end of the tail of two colours, fuliginous ^ 
canescent ; “ the black tail-tuft, surrounded by a pale-grey margin.” The description 
not agree sufficiently with the present form to render it probable that it refers to the sa 
species; the description of the tail, and especially of the tuft at the end, shows 
Western Turkestan animal to be distinct, and the tail is said to be shorter than the 
G. collium is, however, said to be allied to G. tamaricinus ; so it probably resenw ^ 
G. cryptorhinus very closely. G. opimus, G. meridianus, and G. tamaricinus are also sal 
to be found in Western Turkestan. 
Family — DIP 0DID2E. 
39. DlPUS LAGOPTJS. 
Lichtenstein in Eversman’s Reise nach Buchara, p. 121. — Brandt, Bull. Ac. Imp. St. Pet., 1844, ii, p- 
1, Ivoshtak, South of Yarkand ; 2, Yarkand ; 3 Yangihissar. 
These specimens agree on the whole fairly with Lichtenstein’s original description 
measurements ; the ears are rather larger, hut the difference does not appear great, 
tarsi are also a little longer. The following is a short description : colour above light s® 0 y, 
brown, slightly washed with dusky; below pure white ; a white band across the outside 
the thigh. Tail pale-brown above, whitish below, with a tuft of longer hair, altog e ^ 
about 2^ inches long ; at the end the terminal portion pure white, the proximal portion 
or dark-brown on the upper part and sides, but brown or white beneath the tail- 
fur is very soft and rather long, 0 - 6 to 0'8 inch in the middle of the back ; on the np 
J A. Milne-Edwards, Ann. Sc. Nat., Ser. 5, Vol. vii, 1867, p. 377. — Rech. Mam., p. 142, PI. Xa, XI. 
2 Hardwicks, Trans. Lin. Soc., viii, p. 279, PI. VII. 
3 W. Blanf., Eastern Persia, ii, p. 66, PI. VII, fig. 1. 
4 Gray, Ann. Mag. Nat. Hist., 1842, Ser. 1, x, p. 266 (nee Jerdon, Mam. Ind., p. 187.) 
5 Jerdon, Mam. Ind., p. 186. — W. Blanf., Eastern Persia, ii, p. 68. 
6 A. Milne-Edwards, Rech. Mam. p. 144. 
7 Turk. Jev., p. 83 ; Ann. Mag. Nat. Hist., July, 1876, Ser. 4, xviii, p. 55. It appears to have been first called M- 
but the name was changed because of there being a South African species called Gerbillus montmus. 
