200 THE AMERICAN NATURALIST. [Vor. XXXIV. 
revision of the group,! recognizing three subgenera, twelve spe- 
cies, and nine additional subspecies, of which two subgenera, 
three species, and five subspecies are characterized as new. 
One of the species, and the only non-American species known, 
is the Zapus setchuanus, from Szechuen, China, the type and 
sole representative of Preble’s new subgenus. Eozapus. The 
molar pattern, as figured by Preble, is, however, so different in 
this type from that of the American forms of Zapus that it 
seems well entitled to full generic rank. The twenty Ameri- 
can forms are separated into two subgenera, Zapus proper and 
Napaeozapus, the latter differing from the former mainly in the 
absence of the minute upper premolar always found in Zapus. 
Napzeozapus comprises the single species, Z. insignis, described 
by Miller in 1891, with its subspecies abietorum and roanensis. 
The Z. insignis group, characterized among other features by 
a white-tipped tail, in contrast with the species of Zapus, is an 
Eastern type, described originally from New Brunswick, and since 
found to range southward, in the Canadian fauna, to the moun- 
tains of North Carolina, where it forms Mr. Preble’s subspecies 
roanensis, and westward to the north shore of Lake Superior, 
where it constitutes the same author’s subspecies abietorum. 
These subtractions leave seventeen forms —ten species and 
seven subspecies — in the restricted subgenus Zapus, which 
collectively cover the whole of the North American range of 
the genus Zapus, the subgenus Zapus being found throughout 
the range of Napzeozapus as well as elsewhere. 
As already said, only one species, Zapus hudsonius, was rec- 
ognized prior to the description of Z. insignis Miller in 1891, 
but of course many other forms were confounded under this 
name; but even now in its restricted sense, or as defined by 
Preble, it has, including its four well-marked subspecies, by far 
the most extensive range of any member of the genus, being 
found from the southern shore of Hudson Bay southward to 
New Jersey and in the mountains to North Carolina, and west- 
ward to Iowa and Alaska. 
1 Preble, Edward A., assistant in Biological Survey. Revision of the Jumping 
Mice of the Genus Zapus, North American Fauna, No. 15, Aug. 8, 1899, pp. 1-41) 
1 plate and 3 text-figures. 
