MAMMALIA. 



59 



parts it is ashy-grey at the base and for the greater part of its length, pale sandy-brown 

 near the end, the extreme tip dusky brown ; on the lower parts it is white throughout. 

 Ears about half the length of the head, oval, naked inside, thinly clothed with short brown 

 hair outside ; face sandy ; the hairs grey at the base ; sides of head whitish ; whiskers, as 

 usual, very long, exceeding 3 inches ; the uppermost brown, the longest white, except at 

 the base, the lower entirely white ; the long hairs beneath the hind-feet all white, as are the 

 feet throughout. 



The following dimensions, doubtless from the freshly killed animal, are marked by 

 Dr. Stoliczka on the label of the specimen from Koshtak : — 



Inch. 



Whole length, tail included . . . . . . . . . 1175 



Length of tail (hairs at end included apparently) . . . . . 6*75 



Distance from snout to eye . . . . . . . . 0'7 



Do. eye to ear ......... 0*25 



Length of ear measured behind . . . . . . . . 0'75 



Breadth of do 0-55 



Length of fore-foot and claws 0 - 55 



Do. hind-foot 0-8 



Do. tarsus . . . . . . . . . . 1*75 



Length of foot (hind-leg) measured from knee 4 



In dried specimens the ear measures 0*65 from the orifice, and 0*5 in width ; tarsus and 

 hind-foot from calcaneum to end of claws 2'35. 



The following are the dimensions of an adult skull : — 



Metre. Inches. 



Length -033 1-8 



Breadth across zygomatic arches . . . . . . -021 084 



Length of nasal bones . . . . . . . . -013 0'52 



Breadth of do. behind -003 0-12 



Do do. in front -004 0-16 



Height of orbit -008 0"3 



Breadth of do '0045 0- 18 



Breadth of frontal region between orbits ..... *010 0"4 



Length of molars of upper jaw taken together "... *006 0 - 23 



Breadth of palate between last molars . . . . . '004 0*15 



Length of lower jaw from angle to symphysis . . . '0155 0 - 6 



Height of do -0075 0'29 



The dentition agrees with Brandt's description. There are 4 molars in the upper jaw, 

 3 in the lower, on each side ; the anterior upper molar is minute, simple, almost cylindrical ; 

 the other three each with 3 convex folds outside, the anterior fold being much smaller than 

 the others, and two folds inside ; in the lower jaw the anterior molar has 3 folds inside, 

 2 outside, the second 3 folds on each side, the third 2 folds outside, but no distinct fold 

 inside, a groove which occurs there being confined to the crown of the tooth and doubtless 

 disappearing in older skulls. 



This species was described by Lichtenstein from a pair obtained by Eversman, on his 

 return journey from Bokhara, in the deserts near the Sea of Aral. Severtzoff includes it 

 in the list of animals found in Western Turkestan. 1 It is a typical Dipus. D. jaculus, 

 D. acontion, D. sagitta var. telum, and D. platyurus are also said by Severtzoff to be 

 found in the same country. 



1 Turk. Jev. } p. 62; Ann. Mag. Nat. Hist., July, 1876, Ser. 4, xviii, p. 56. 



