Fres., 1912. Mammats oF ILLINoIs AND Wisconsin—-Cory. 315 
Remarks — Young pups of this species have the muzzle blackish at 
birth, fading in a few weeks to grayish; head grayish, in decided 
contrast to the black of the back, nose and ears; ears black at tip, 
fading to grayish in a few weeks; tail black, fading to gray, the 
tip black. 
There is much variation in the color of Wolves from the same 
locality,* and from lack of specimens from large areas for comparison 
the distribution of the various supposed species cannot be definitely 
determined at the present time. It is by no means improbable that if 
a sufficiently large series could be assembled, those which occur in the 
United States might ultimately be considered geographical races of 
one species, 7. €., Canis mexicanus Linn. From the material examined 
I am unable to decide whether or not the Wolf which occurs in Wiscon- 
sin is separable from the Nebraska form. The skulls which I have seen 
from Nebraska are somewhat larger than any from Wisconsin or Michi- 
gan and have the postorbital processes of the frontal bone longer and 
less abruptly decurved, and the zygomatic breadth is relatively and 
actually greater. On the other hand a specimen from Kansas agrees 
very well with those from Wisconsin and it is not unlikely these cranial 
differences may be due to age or sex. For the present at least it would 
seem best to consider the form which occurs within our limits to be 
Canis nubilus. 
CRANIAL MEASUREMENTS. 
(In millimeters) ee oe 
Champion Platte oF on 
eneiade Marquette ERE, River, ame, Reames 
Ae oad Field Mus Re eeeoe. i M ma e a 
0. 916 No. 2568. No, 1314. No. 884. 
Greatest length of skull..... 250 254 245 254 240 240 
Basal length............... 221 222 230 223 214 217 
Basilar length of Hensel .. . 218 215 222 218 205 210 
Palatilar length............ 120 15 118 114 113 120 
Zygomatic breadth......... 127 129 122 137 133 137 
Mastoid breadth........... 81 78 77.5 80 78 80 
Greatest breadth of brain 
CASE ie alo comme one eons 68 68 62 66 66 65, 
Narrowest breadth of 
FOSTIUM s yesec date Gas. Bees 45 42 45 45 46 45 
Interorbital breadth........ 43 49 43 52 46 46 
Breadth between ends of 
postorbital processes..... 53 68 53 70 60.4 65 
Length of crown of upper 
CATNASSIAl. oa on anew eases 25 23 25 23 24 25 
* While the majority of Florida Wolves (C. ater) were probably black, according 
to statements of my Indian friends, gray and brownish individuals were not un- 
eemmon. Robert Osceola killed a black Wolf with two black pups in the Big Cypress 
near the Everglades and another black Wolf with three pups, two of which were 
gray and one black, in the same locality. 
