Sept. 20 BANGS— NEW LABRADOR RODENTS 4I 
1900 
Measurements— Type, &, adult, but not old: total length, 120; tail ver- 
tebrz, 22; hind foot, 21. No. 3972, d, young adult, from Hamilton Inlet: 
total length, 114; tail vertebra, 25; hind foot, 21 mm. 
Skull, type, g adult: basal length, 24.4; occipitonasal length, 26.; zygo- 
matic width, 15.6; mastoid width, 11.8; least interorbital width, 3.6; length 
of nasals, 6.6; length of palate, to palatal notch, 14.2, to end of pterygoid, 
18.8; length of incisive foramina, 5.; length of upper tooth row, alveoli, 7.4; 
length of single half of mandible, 17.6; length of lower tooth row, alveoli, 
6.8 mm. 
Remarks.— As the type of P. tnnuztus medioximus is younger 
than the type of true S. zvnuztus, but even so is larger, the new 
form must be a considerably bigger animal. No comparison can 
be made between the colors of true S. zzmuitus and S. innuitus 
medioximus, the type of the former having been kept in alcohol 
for a long time. S. énnuitus medioximus differs widely in color 
from SS. sphagnicola, which is hardly distinguishable in this respect 
from \S. cooperi or S. fatuus and very different from the russet 
hazel coloring of the new form. 
I am much indebted to Mr. E. A. Preble of the Biological 
Survey at Washington, who with great kindness made minute 
comparisons for me, with the types of S. izmuztus and S. sphagni- 
cola. 
