280 On a new Three-toed Jerboa from China. 
D. sagitta and D.-deasyi, B.-Ham. The type-specimen of 
D. halli, measured in the flesh, was 5’ or 127 mm., while the 
largest specimen of D. sowerbyi in the British Museum 
collection, measured in the flesh, was 117 mm., the type- 
specimen measuring 116 mm. ‘The tail, as judged from the 
second of the two specimens, that of the type being imperfect, 
is about equal to that of D. sowerbyi., Other measurements 
were not made in the flesh, but from a comparison of thie 
dried speciniens a noticeable difference appears in the relative 
lengths of the hind feet, that of D. halli being some 5 mm. 
shorter than in the type-specimen of D. sowerbyi. The ear, 
as far as can be judged, is about the same length in the two 
forms. In colour and markings D. halli may be said to be 
as in D. sowerby?, except that the general shade of the upper 
parts is less buffy and more drab; but it must be stated in 
this connection that one specimen of D. sowerbyi in the 
British Museum collection comes very near to D. halli in the 
drabbiness of its colour. General colour drab-fawn on thie 
head and back, shading to buff-fawn on the sides; outer 
surface of thighs rich buffy, as in D. sowerby7; tail in second 
specimen much worn, but apparently much as in D. sowerbyi 
—1. ¢., ‘ buffy or pale fawn above, white below ; the terminal 
half-inch white, the blackish band preceding it about three- 
quarters of an inch in length.” The whole of the under 
surface, together with the fore legs, inner surface of thighs, 
hind feet below the heel, and rump-streak white. 
Skull—Larger, longer, and with smaller bulle than in 
D, sowerbyi, the nasals also being distinctly longer and 
slightly broader. In reference to this last characteristic, it 
may be stated that the muzzle of D. sowerbyi was described 
as broader than in J). deasyi. Otherwise the skull of our 
new species agrees very much with that of D. sowerbyt. 
Dimensions of type :— 
Head and body 127 mm. (5'’); tail (imperfect) ; hind foot 
(measured in dried specimen) 60; ear (measured in dried 
specimen) 18. 
Skull: greatest length 37; basilar length 28:2; greatest 
breadth 24:2; nasals 15; breadth of muzzle 5:9; palatilar 
length 22; palatal foramina 6x3; length of upper tooth- 
row (molars only) 5°8. 
Hab. Chih-teng, N.E. Chihli, N. China. 
Type. Adult female. B.M. no. 19.12. 22.15. Kept in 
captivity, died and skinned Dec. 1916. Collected by Mr. A. 
L. Hall, presented by Mr. J. D. de La Touche. Two 
specimens. 
The two specimens were taken by Mr. Hall some time in 
