38 BANGS— NEW LABRADOR RODENTS eae 
MEASUREMENTS (in millimeters). 
Total Tail Hind 
No. Sex and age Locality length vertebrae foot Ear 
8839 (type) d, old ad. Lance au Loup 790 166 124 36 
8837 d, old ad. Sle 787 192 106 35 
8838 &, old ad. RSA ASS! see 753 195 97 36 
83834 dg, old ad. oan gs 757 204 97 34 
8835 &, old ad. ely ae. pees 172 115 40 
8836 Q, old ad. Ge 762 182 112 40 
8840 ?, old ad. 2D 697 183 104 32 
8832 2, old ad. Black Bay 702 196 104 31 
8843 Q, adult Lance au Loup 652 151 97 31 
8844 2, adult iV SES 650 172 94 33 
8841 ©, adult BB 643 148 98 35 
8842 2, adult spake ta i: 633 157 100 ar 
8845 &, youngish aE ge eSoanESS 615 146 85 2 
8846 &, youngish oe Ta 580 149 go 33 
8833 ?, youngish Black Bay 585 178 81 26 
8847 &, young Lance au Loup 568 134 88 2 
(Note.— On account of their obesity, the troublesome quills and the thick- 
ness and rigidity of their tails, porcupines are extremely troublesome animals 
to measure in the flesh, and collectors’ measurements must always be taken 
with a good deal of allowance one way or the other.) 
Skull, type, old adult male: basal length, 99.6; occipitonasal length, 104.; 
zygomatic width, 76.; mastoid width, 47.8; least interorbital width, 34.; length 
of nasals, 35.6; width of nasals, 23.6; length of palate, to palatal notch, 49.2, 
to end of pterygoid, 78.; upper tooth row, alveoli, 25.; length of mandible, 
83.; lower tooth row, alveoli, 30. mm. 
Cranial characters. E.. dorsatus picinus has a rather heavier skull, with 
wider, stronger rostral portion, than £. dorsatus dorsatus; incisor teeth are 
heavier and decidedly paler in color — yellowish instead of orange; molariform 
teeth smaller; the nasals average shorter; palate narrower between molari- 
form teeth, shorter and more cut away posteriorly; posterior narial aperture 
decidedly smaller. 
Remarks.— The Labrador porcupine differs from true Z. dorsa- 
tus of the upper Transition and Canadian zones, of eastern North 
America, chiefly in its uniform black color, the grayish white 
hairs that are so conspicuously sprinkled over the back and head 
of the Canadian animal never being present in Labrador speci- 
mens. It also seems to be larger, though the porcupines grow 
slowly and apparently take several years to gain full size. Com- 
parisons in size and proportions are therefore not easy to make 
without very large series. 
