sigh BANGS — NEW LABRADOR RODENTS 39 
I find a very decided individual variation in the skulls of both 
forms, so much so in fact that average differences must be used 
to distinguish them. The Labrador series compared with an 
equally good series in our collection, from New Hampshire, 
Maine, and Nova Scotia, shows good characters of this sort, as 
pointed out above. 
Phenacomys celatus crassus* subsp. nov. 
Type, from Rigoulette, Hamilton Inlet, Labrador, &, old adult, no. 3959, 
coll. of E. A. and O. Bangs, collected Aug. 15, 1895, by C. H. Goldthwaite. 
Subspecific characters.— Like true P. celatus, except very much larger, with 
a similar, but bigger, skull. 
Color.— Upper parts rich cinnamon brown, much mixed along back and on 
head with dark brown (about Prout’s brown) hairs; sides, and usually region 
behind ear, paler—approaching wood brown; rump and flanks rather more 
russet; snout, back to base of whiskers and eye, clear cinnamon to cinnamon 
rufous; under parts grayish white; under fur slate-color; feet and hands 
grayish white; tail bicolor—whitish below, brown above. 
Adult specimens taken at Hamilton Inlet in summer do not differ essentially 
in color from the one example from Lance au Loup, which was killed in May, 
and is in full winter pelage. In some of the former the fur is rather ragged, 
but the colors are little changed. 
MEASUREMENTS (in millimeters). 
Total Tail Hind 
No. Sex and age Locality length vertebrae foot Ear 
3946 aaad: Hamilton Inlet 160 37 20 15 
3960 ?, ad. _ . 147 37 20 15 
3958 Opad: 2: 3: 157 37 21 17 
3959 (type)  d, ad. 4 + 157 37 20 16 
3961 Q, ad. a «6 158 40 20 15 
8851 é, ad. Lance au Loup 145 33 20 14 
Skull, type, f adult: basal length, 26.; occipitonasal length, 28.; zygo- 
matic width, 15.6; mastoid width, 11.8; least interorbital width, 3.4; length 
of nasals, 8.; length of palate, to palatal notch, 13.8, to end of pterygoid, 
19.4; length of incisive foramina, 5.4; length of upper tooth row, alveoli, 
6.2; length of single half of mandible, 17.2; length of lower tooth row, 
alveoli, 6. mm. 
1 Crassus — thick, large, fat. 
