1895] -` Zoology. 941 
PHENACOMYS ORAMONTIS sp. nov. Type, ad. ¢ ; col. of S. N. 
Rhoads, No. 2354. Col. by A. C. Brooks on the Mt. Baker Range 
(alt. 6000 ft.), Westminster Dist., B. Columbia, Aug. 6, 1895. 
Description: Above uniform blackish-brown, feet grayish, blackish 
at instep and wrist, nearly white on digits. Upper tail blackish, lower 
tail gray, tip white. Lower parts soiled white, showing the plumbeous 
bases of pelage. Ears smaller, but nearly as prominent, as in an Evo- 
tomys of same size. 
Measurements: Total length, 154 mm.; tail vertebre, 38; hind 
foot, 20.5. Skull: basilar length, 23; length of nasals, 7.8; interor- 
bital constriction, 3.4; zygomatic expansion 15.7 ; length of interpari- 
etal, 4.1; width of same, 6.9; length of mandible, 16.3; greatest 
breadth of same, 9.2. 
This short-tailed Tree Vole is very different from P. longicaudus 
True, its nearest geographic ally. From P. intermedius of south cen- 
tral British Columbia it is distinguished by the exceedingly small size 
of the outer last triangle of m. 3 and that it is distinctly cut off from 
the posterior loop. In m. 1 there is a broad crescentic loop as in Dr. 
Merriam’s figure of P. /atimanus but differing therefrom in its being 
completely cut off from the first outer triangle (loop) with which, in 
latimanus, it forms a trefoil. From all the four forms first described 
by Dr. Merriam it differs in having the second loop of m.3 almost 
completely divided into two sections by the exaggeration of the outer 
angle of this loop (see fig. of latimanus, pl. IV, N. A. F., No. 2) and 
the acuteness of the next entrant angle on the same side, forming a 
small outer median triangle whose inner angle is so nearly closed by 
the impinging enamel walls that the gap can only be seen by a glass. 
In this feature it resembles P. orophilus of Idaho, from which it dif- 
fers in no essential dental characters. In color, however, the two are 
distinct and oramontis has an interparietal like celatus, which Dr. Mer- 
riam states to be very different from that of orophilus. There may be 
other cranial differences, but these are all that can be distinguished 
from the rather meagre description of orophilus. Only one specimen 
was sent me by Mr. Brooks. 
TAMIAS QUADRIVITTATUS FELIX subsp. nov. Type,ad. 9 ; col. of 
S. N. Rhoads, No. 2355. Col. by A. C. Brooks on the Mt. Baker 
Range (alt. 7000 ft.), Westminster Dist., B. Columbia, Aug. 13, 1895. 
Description: Colors and color pattern as in quadrivittatus but much 
darker than that type. Darker also than T. q. affinis or T. q. luteiven- 
tris, which latter it most nearly resembles. From /uteiventris of the 
same season it is distinguished by: (1) greater breadth and depth of 
