376 University of California Publications in Zoology (VoL. 24

arrive at an understanding of conditions. Osgood (1909, pp. 50, 52,
59) has commented upon the situation and pointed out some of the
difficulties. If, as he asserts, there are places where two subspecies
oceur together, each in typical form, the problem is even more involved
than appears from my own material. I did not find this to be the
case in the critical regions worked on the Skeena River or on the
Stikine River (see Swarth, 1922, p. 164).

TABLE 2

MEASUREMENTS IN MILLIMETERS (AVERAGE, MINIMUM, AND MAXIMUM) OF
ADULT Peromyscus

Total Tail Hind
length vertebrae foot
Peromyscus m. borealis | Telegraph Creek, B.C. 170.2 75.3 20.2
(10 spec.) (158-192) | (65-105) (19-22)
Peromyscus m. borealis | Hazelton, B.C. 176.5 87.3 20.6
(10 spec.) (170-186) | (75-95) (19.5-22)
Peromyscus m. borealis | Kispiox Valley, B.C. 192.8 97.0 22.0
(8 spec.) (186-210) | (88-106) (21-24)
Peromyscus m. borealis | Nine-mile Mt., B.C. 190.0 99.0 PAN
(10 spec.) (168-214) | (79-121) (21-23)
Peromyscus m. macror- SE. Alaska. 203 .3 108 .2 24.3
hinus (10 spec.) (197-218) | (104-116) (23-26)

Neotoma cinerea saxamans Csgood. Northern Bushy-tailed Wood Rat

Seven specimens collected (nos. 32699-32705): three adults and
two juveniles on Nine-mile Mountain; one adult and one juvenile in
Kaspiox Valley. They are indistinguishable from specimens from the
Stikine River and all are apparently typical of the subspecies
saxamans.

The local distribution of the bushy-tailed wood rat in this region
presents some puzzling features. The animals are abundant in the
mountains, where they are preéminently rock dwellers, and it is an
easy matter to find sign of their presence in such surroundings. The
valleys generally are covered with forest, with dense underbrush
beneath the trees, and there are vast areas where no rock formation
of any sort is to be seen. In such woods [ was never able to find wood
rat sign. In many places in these poplar-covered lowlands, however,
ranching has been attempted. ground has been cleared and eabins