A NORTHERN ZOOLOGY. 
The tail projects about a line beyond the membrane. The toes of the hind-feet are rather 
long, and have white, slender claws, not greatly curved, with a few long hairs projecting over 
them. The wing-membrane is naked, and the joints of the fingers correspond with those 
of the vespertilio pruinosus, and the rest of the genus, as restricted by Geoffroy. The 
thumb is about two lines and a half long, laces its slender claw, which rather exceeds half 
a line. 
Height of ear . 
Breadth of ditto near the middle 
It is broader at the base. 
DIMENSIONS. 
Inches. _ Lines, Inches, Limes. 
Length of body and head 2 . " 1 10 Height of the tragus . ° . 0 4} 
39 tail : ; : 1 6 Spread of wings from tip of the middle 
55 head . ° 5 ° 0 finger of the right wing to the tip of 
0 
0 
9 
8 the corresponding finger of the left 
4 wing . ° > . 10 0 
This Bat is the most common species near the eastern base of the Rocky Moun- 
tains on the upper branches of the Saskatchewan and Peace Rivers. Mr. Say’s 
specimen was obtained near the head of the Arkansas, within sight of the moun- 
tains ; and the description he gives of it corresponds so nearly with my specimens, 
that I have no hesitation in considering them to be the same. Say’s Bat has a 
general resemblance to the Vespertilio pipistrellus of the British isles; but the 
latter has one grinder of a side fewer, weaker canine teeth, a smaller ear, and a 
shorter thumb and claw. Its fur is likewise shorter, and its back and belly do not 
exhibit such distinct shades of colour. It seems to approach near to the Vespertilio 
emarginatus of Geoffroy, as Mr. Say has remarked; but I have not been able to 
obtain a specimen of the latter with which I might compare it. The Carolina 
Bat differs in the shape of the tragus, which is semi-cordiform, but resembles this 
one nearly in the colour of the fur and in general form. 
> « 
