40 BANGS — NEW LABRADOR RODENTS ea 
Remarks.— No comparison of colors can be made between this, 
the largest Phenacomys yet described, and true P. celatus. The 
new form, however, differs in color but little from P. /atimanus, 
which is otherwise very distinct, and the chances are that, in 
color, all the yellow-faced forms are much alike. 
P. celatus crassus is a very much larger animal than true P. 
celatus. Young specimens from Hamilton Inlet, just emerging 
from the nursing pelage, are about the size of adults of P. celatus 
celatus; thus no. 3967 from Hamilton Inlet, wholly in the pelage 
of a nursling and with a baby skull, measures: total length, 133.; 
tail vertebre, 34.; hind foot, 20.; ear from notch, 14.5 mm. 
Synaptomys (Mictomys) innuitus medioximus’* subsp. nov. 
Type, from Lance au Loup, Labrador, & adult, no. 8852, coll. of E. A. and 
O. Bangs, collected April 15, 1899, by Ernest Doane. 
Subspecific characters.— Larger than true S. ¢zuitus; skull larger in every 
way, except that it is proportionally flatter, and differing slightly otherwise. 
Color and pelage— Type, April, full winter pelage: fur very long and 
soft,— almost fluffy,—nearly concealing the ears, with scattering, longer, 
stiffer hairs projecting beyond it, which are most numerous on rump and 
flanks. Upper parts rich brown —back and head dull russet, very thickly set 
with black-tipped hairs, rump and flanks shading decidedly toward hazel and 
with fewer black-tipped hairs; long hairs on ears, and in front of and behind 
ears, hazel; patches at base of whiskers, meeting across nose, dull hazel. 
Under parts dull smoke gray; under fur slate-color; feet and hands dusky; 
tail dusky above, grayish below. 
No. 3972, d, youngish adult, from Hamilton Inlet, July 12, is in very short 
summer pelage, with the colored portion of the hairs much worn down. 
Otherwise it differs little from the type; and where enough of the colored 
portion of the hair remains, the decidedly russet hazel coloring is plainly 
shown. 
Cranial characters.— Skull much larger than that of true S. zz#27ts, but 
proportionally flatter; rostrum less deflected; visible portion of posterior end 
of frontals much larger (much less encroached upon by the overlapping edges 
of squamosals); edge of the maxillary portion of zygoma bounding the ante- 
orbital foramen, much more convex, so that the anteorbital foramen, viewed 
from the side, is more rounded and larger; incisor teeth and molar teeth 
heavier, and the molar series longer. 
1 Medioximus — middlemost, holding a middle place. 
