1R5 



ALAGTAGA. 



Dipus Jaculus. D. cauda longissima apice pfttnata nigro-atba, 

 pedibus posticis maximis pentadactylis. Pall. Glir.p. 87. and 

 275. Mvs. 



Pale-brown Jerboa, white beneath, with extremely long penta- 

 dactyle hind-feet, and very long tail with subpennated black- 

 and-white tip. 



Siberian Jerboa. Pennant Quadr. 2. p. 166. 



Alagtaga. Bnf. 13.7). 141. Schreb. saevgtk. p. 842. 



Ix its general appearance this species perfectly 

 resembles the common or Egyptian Jerboa, but is 

 considerably larger, though there appear to be 

 permanent varieties or races which are, on the 

 contrary, much smaller than the common species. 

 It is principally distinguished by the remarkable 

 character of the hind feet, each of which has a 

 pair of very conspicuous spurs or additional toes, 

 situated at some distance above the front toes, 

 and furnished with sharp claws. 



In the Leverian Museum is a very fine speci- 

 men of this animal, which has .been figured in 

 Mr. Pennant's History of Quadrupeds. The co- 

 lour of the Siberian Jerboa or Alagtaga is nearly 

 the same as that of the Earptian ; but there is no 



Ov I 



appearance of the dusky band across the lower 

 part of the back, or any transverse undulations ; 

 the whole upper parts being of a pale yellowish 

 fawn-colour, and the under parts white. Its 

 length is about eight inches, and the tail ten. It 

 is found, according to Dr. Pallas, from the Cas- 

 pian sea to the river Irtish, but is no where very 



