541 
[Bangs. 
Cranial Measukements of Five Skulls Exgu of Putorius (Lutreola) 
vison (Brisson) and P. (L.) vidgivagus Bangs. 
Putorius (Lutreola) 
Putorius (Lutreola) 
vison. 
vulgivagus. 
= 
„- 
^- 
= 
>• 
Burbridge, La. 
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g 
rt-d 
X 
.5P-C 
>.'T3 
O^ 
ti 
S2 
^^ 
K2 
si 
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1-3 
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57.4 
56.8 
58.2 
c3 
58.6 
51.4 
61.2 
60 
62.2 
59.4 
Basilar length of Hensel. 
51.2 
Occipitonasal length. 
57.2 
56.4 
56.4 
58.6 
51.6 
59.8 
61.2 
61.4 
60.2 
51.4 
Greatest zygomatic breadth. 
38 
37 
38 
37.2 
32.8 
38.6 
37.2 
40.4 
37.8 
33.2 
Breadth across postorbital pro- 
cesses. 
16.6 
15.4 
17.2 
16.8 
14.8 
19 
18.4 
18.2 
19.4 
16 
Height of cranium from palate 
to point between postorbital 
processes. 
12.2 
11.6 
12.4 
12.6 
11.8 
14.4 
14.2 
14.8 
15.4 
13.2 
Height of cranium from basio- 
sphenoid to parietal. 
17 
17.8 
18.4 
18.6 
16.2 
19.6 
19.4 
19 
19.6 
17.2 
Greatest length of under jaw. 
36.4 
36.8 
37.2 
37.6 
31.2 
38.8 
39.4 
40.6 
39.6 
33.2 
Height of coronoid process from 
angle. 
u 
13.4 
13.2 
13.2 
12 
14.2 
14 
14 
14.2 
12 
DESCRIPTION OF A SUBSPECIES OF MUSKRAT, FIBER ZI- 
BETHICUS RIVALICIUS SUBSP. NOV., FROM LOUISIANA. 
The muskrat has long been known to occur in the lower Mis- 
sissippi region and along the swampy coasts of the adjacent 
States of Alabama and Louisiana, but I know of no specimens 
from there having come into collections, until I sent Mr. F. L. 
Small, in Jan. 1895, to make a collection of mammals in this 
rather desirable section of the country. 
He reported the muskrat as being very common all through 
the Bayou country and sent me in the early part of February 
three adults and three young from Bm-bridge. La. He kept on 
collecting at Burbridge, making a nice series of muskrats, and 
then shifted to another part of the State, taking the skins with 
him, Avhere they were all destroyed by an unfortunate fire, which 
