251 
GENUS MERIONES— Illiger. 
DENTAL FORMULA. 
Incisive - ; Canine — ; Molar = 16. 
2 0—0 3—3 
Cheek-teeth tuberculous, the first with three, the second with two, 
and the third with one, tubercle. 
Nose sharp, ears moderate ; fore-feet short, with the rudiment of a 
thumb ; hind legs long, terminated by five toes with nails, each with a 
distinct metatarsus. Tail, very long and slender ; mammae, from two to 
four pectoral, and from two to four abdominal. 
Habits nocturnal, many hibernate. 
There have been eleven species described as belonging to this genus, 
as it is now restricted ; one well determined species has been discovered 
in North America, the rest are found in sandy and elevated regions, in 
parts of Asia and Africa. 
The word Meriones is derived from the Gr. (merion), the thigh. 
MERIONES HUDSONICUS.— Zimmerman. 
Jumping Mouse. 
PLATE LXXX V. — Male and Female. — Natural Size. 
M. Supra saturate fuscus, infra albus, linea laterali flava inter colorem 
fuscom albumque intermedia ; cEiuda corpore longiore. 
characters. 
Dark reddish-brown above, with white underneath ; sides yellow, separating 
the colours of the back from the white beneath ; tail much longer than the body. 
DiPus HuDSONicns. 
“ Ambkicanus. 
“ Canadensis. 
synonymes. 
Zimmerman. Geogr. Geschich., II. p. 
Barton, Am. Phil. Trans., 4. vol. p. 358 — 232. A. D. 1782. 
Davies’ Linn. Trans., 4. 165. 
