430 



VERTEBliATA. 



in India; the Egyptian Gerbil, G. JEgyptiacus, the Dipus Gerbillus of Olivier; the Gerbil 

 of the Pyramids, G. pyramidtun, both found in Egypt; Burton's Gerbil, G. Burtoni, of 

 Eastern Africa; the Short-tailed Gerbil, G. brcvicaudatus, and the African Gerbil, G. 

 nfir of Gray, both of Southern Africa; the G. pygargus, of Upper Egypt and Senegal; Shaw's 

 Gerbil. (i. jS/iaivii, of Northern Africa. There are other species, not fully described, in Alge- 

 ria, bordering on the Desert of Sahara. 



Genus PSAMMONYS: Psammonys of Rappel. — This comprises a single species, the P.obesus, 

 the size of a common rat, resembling both the field-rat and the gerbil, and found in India and 

 Arabia. 



SMINTHUS LOUIGER. 



Genus SMINTHUS : Sminthus. — This contains the S. loriger — described by Nordmann — two 

 and a half inches long, with a tail of nearly equal length. It is of a grayish-brown, with a blaek 

 band running along the back. It is dormant in winter. The Mus betelinus of Pallas is referred 

 to the same genus by Nilsson. 



CAFFRAR1AN OTOMTS. 



Genus MERIONES: Meriones. — Under this term, used by Hliger as synonymous with ( <> r 

 billus, and which is equivalent to the Jaculus of Waglcr, is included but a single species, the 

 Labrador or Canada Jumping-Mouse, which is sometimes called the Canada Jerboa ; it is the 

 Gerbille du Canada of F. Cuvicr; the M. Labradorius of Richardson ; the M. Americanus of Do 



