CLASS I. MAMMALIA: ORDER 7. RODENTIA 



419 



jerboa, with a tail long and tufted at the end, and living on vegetable food Their eheek-pou 

 open externally. 



Phillips's Pouched Geeboa-Mouse. L. PhilUpm. is about as large as the chip-squirrel, having 

 a body five inches long ami a tail six and a half inches: the color is light-brown above and white 

 beneath. The wkiskei#are rigid and numerous, hind-legs very long, the fur silkv. the eyes bright, 

 the form and appearance like a very minute kangaroo. It hops about on its hind- _-. rten 

 taking considerable leaps. It lives in holes in the arid plains - - mora and Southern California, 

 seeming to prefer stony slopes, and frequently comes around the tents of travelers with a sort of 

 confiding gentleness and familiaritv. It seems to go forth ehiefiv at nitrhtfall. 



S veral other species of this genus have been recently discovered. Obd's Pouched-Mou-h. D. 

 Ordii, is dark-brown above and white beneath; the tail is short and tufted at the end; it is a 

 little smaller than the preceding, and is found in the vicinity of El Pa>- . 



The Agile L>ipodomys. I), agilis, is ten and a half inches long, the tail six and a half: the 

 color a Yeilow^h-brown above; on the sides and beneath it is white: eyes larofe : lar_ I rnal 

 cheek-pouches : hind-legs very long. It is a beautiful species, leaps with surprising asrility, some- 

 times ten feet at a bound. It forms extensive burrows, and is difficult to be captured. It abounds 

 in the cultivated fields and vineyards near Puebla de los Angelos, California. 



Hermann's L'ipodomts. D. Hernial . - :>und in the Sierra Nevada, but is little known. 



Genus MACROCAITLLS : Macrocaulus. presents a single S] : s, M. halticus ; this has the 

 bodv four inches, and the tail six inches long. It is found in Mex: . Las not been fully de- 



scribed. 



JEREOAS- 



THE DIPODLELE. , ' 



This curious family embraces three tribes of small animals : the Jerboas. Pedctier.s, and C 

 iaebfUeng. 



THE JERBOAS OB JERBOID.E. 



This tribe has been divided into several genera by some naturalists, - v § ■•rtomys. 



