TAMARISK., AND CANADIAN JERBOA. Ilf 
Tamarisk jerboa. 
This species, which was first described by Dr* 
Pallas, is about the size of the brown rat. It is 
an inhabitant of the most southern parts of the 
Caspian deserts, and probably of the warmer parts 
of Asia. It delights in low grounds and salt 
marshes, and burrows under the roots of the tama- 
risk bushes. The animal comes out by night to 
feed, and makes its principal repast on succulent 
maritime plants, as the salsola, &c. ; which, in 
the salt deserts it inhabits, are very plentiful. The 
head of this species is oblong ; the whiskers large ; 
the nose blunt, and the nostrils covered with a 
flap ; the eyes large ; the ears large, oval, and 
naked : the space round the nose and eyes, and 
beyond the ears, white ; the sides of the head and 
neck cinereous ; the back and sides yellowish grey ; 
the tips of the hairs brown ; the breast and belly 
white ; the tail ash-coloured, and annulated more 
than half-way from the base with rings of brown ; 
the hind legs are long in proportion to the fore 
legs, and the feet are longitudinally black beneath ; 
©n the fore feet is a warty tubercle in place of the 
thumb. The length from nose to tail, is about 
six inches ; the tail not quite so long. 
Canadian jerboa. 
This minute species is a native of Canada, and 
appears to have been first discovered by General 
Davies, who had an opportunity of examining it 
during his residence at Quebec, and who has 
described it in the fourth volume of the Transac- 
tions of the Linnaean Society. The description is as 
follows : 
19 As I conceive there are very few persons* 
