ae BANGS — LABRADOR MAMMALS II 
Remarks. Without discussing the synonymy of the jumping 
mouse, it is sufficient to say that not one of the many names that 
have been proposed, applies to the present form, which seems to 
be peculiar to the Labrador peninsula. 
The jumping mouse, I think, will be found to divide into sub- 
species much more readily at the north, than do most small 
mammals, on account of the early date at which it hibernates, 
long before any of the larger bodies of water are frozen over. 
Thus Z. 4. Zadas is widely separated from any other form west of 
it, and if it intergrades with anything else it must be with the 
form that occupies the Canadian and lower Hudsonian zones, 
Zapus h. canadensis, This is the form with which I have com- 
pared it, the specimens coming from Nova Scotia, New Brunswick 
and Maine. 
The color differences that distinguish Z. 2. /adas from Z. h. 
canadensis show well in series, though some individuals can be 
picked out in which they are not so evident; the less sharply 
defined, wider dorsal band is, however, a pretty constant mark of 
Z.h. ladas. It can also be told by its longer tail and by its wider 
skull, especially between the orbits, and its larger audital bulle. 
Fiber zibethicus aquilonius' subsp. nov. 
Three specimens,— an adult 9, skin and skull; a half-grown 
young, skin and skull; anda skull of a three-fourths grown young. 
Type, from Rigoulette, Hamilton Inlet, Labrador, no. 3957, & adult, coll. of 
E. A. and O. Bangs. Collected August 15, 1895, by C. H. Goldthwaite. 
Subspecific characters.— Smaller than true /. sibethicus; general color 
blacker; hind foot smaller; skull smaller, weaker; rostrum long and 
slender; nasals long and narrow; incisors more slender. 
Color.— Summer pelage — upper parts: long hairs on top of head and 
along back, shining brownish black, those on sides and rump tipped with 
burnt umber; under fur slate gray at base, burnt umber at ends. Under 
parts: fur, slate gray at base and pale burnt umber to russet at ends; throat 
and lower abdomen, much grayer; the scattering long hairs shining russet; 
the usual dark brown mark under chin. Tail black; feet and hands dusky 
brown, the fringes of toes lighter — more cinnamon. 
1 A quilonius — northerly. 
