280 On a new Three-toed Jerboa from China. 



D. sagitta and iK deasi/i, B.-Ham. The type-specimen of 

 D. halli, measured in tlie flesli, was 5" or 127 mm., wliile the 

 largest specimen of D. sowerbi/i in tlie British Museum 

 collection, measured in the flesh, was 117 mm., the type- 

 specimen measuring 116 mm. The tail, as judt^ed from the 

 second of the two specimens, that of the type being imperfect, 

 is about equal to that of D. aowerhyi. Otlier measurements 

 were not made in the flesli, but from a comparison of the 

 dried specimens a noticeable difference appears in the relative 

 lengths of the hind feet, that of D. halli beint;; some 5 mm. 

 shorter than in the type-specimen of D. sowerhyi. 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. soiverbyiy except tliat the general shade of the upper 

 parts is less buflfy and more drab; but it must be stated in 

 this connection that one specimen of D. soicerbyi in the 

 British Museum collection comes very near to D. halli in the 

 drabbiness of its colour. General colour drab-fawn on the 

 head and back, shading- to buff-fawn on the sides ; outer 

 suiface of thighs rich buffy, as in D. sowerhyi] tail in second 

 specimen nuicli worn, but apparently much as in Z). sowerhyi 

 — *'. e., " buft'y 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 while. 



Skidl. — Larger, longer, and with smaller bullre than in 

 D. sowerhyi, the nasals also being distinctly longer and 

 slightly bioader. In reference to this last characteristic, it 

 may be stated that the muzzle of T). sowerhyi was described 

 as broader than in D. deasyi. Otherwise the skull of our 

 new species agrees very much with that of D. sowerhyi. 

 Dimensions of type : — 



Head and b>nly 127 mm. (5") ; tail (im|)('rfect) ; 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; breadtii of muzzle 5'9 ; palatilar 

 l(!ngth 22; palatal ft^ramina 6x3; length of upper tooth- 

 row (molars only) 5"8. 



Hah. Chih-feng, N.E. Chihli, N. China. 

 Type. Adult female. B.M. no. 19. 12. 22. 15. Kept in 

 captivity, died and skinned Dec. 1916. Colhcted by Mr. A. 

 L. Hall, presented by Mr. J. D. de La Touche. Two 

 specimens. 



Tlic two specimens were taken by Mr. Hall some time in 



