FAUNA OF THE'SOUTHERN ALLEGHANIES. 397 
The preceding species of mammals, birds, and batrachia, 
accompany very exactly the range of the trout (Salmo fon- 
tinalis). This well known fish is already in South-western 
Virginia, confined to the most elevated peaks and knobs, 
and does not even occur in the streams of many of the 
mountain valleys. In North Carolina its distribution is quite 
similar. I took it in the headwaters of the French Broad, 
and was satisfied that it occurs in the head of the Catawba. 
Dr. Hardy, of Asheville, who is very familiar with the 
Southern Alleghany Region, assured me that it is found in 
the headwaters of the Chattahoochie in Georgia, the only 
example of its occurrence in a river flowing directly into the 
Gulf of Mexico, with which I am acquainted. At the same 
_ time Dr. Peck of Mossy Creek, Tennessee, who has fished 
for trout in most of the Alleghany streams, is of the opinion 
that the fish does not oceur in any streams in the Cumber- 
land Mountains. 
The wood frog (Rana sylvatica) also occurs on the moun- 
tains of North Carolina, but what the southern limit of its 
range in the low lands is, I do not know. 
Of the eighteen species above enumerated, at least ten 
are not found in the southern half or more of the Allegha- 
nian fauna, that is, are not known as residents about Phila- 
delphia, and most of them are not found within a consid- 
erable distance north of that point. Of this number at least 
two belong exclusively to the Canadian fauna, while of the 
remaining eight, five ( Lynx Canadensis, Sciurus Hudsonius,* 
Cervus Canadensis, Setophaga ruticilla and Salmo fonti- 
nalis), are absent or rare in the low countries south of 
Philadelphia. ` 
The value of the isothermal of 65° during April, May 
and June, as a boundary of faune may thus be questioned, 
though it is probably as determinative as any other that 
* A friend long resident in Loudon Co., Va. (on = Potomac), informs me that the 
red squirrel does not occur there. Prof. Baird give in the 8th VoL, U. S. Pac. R. R. 
Rep’t, measurements of specimens from Mississi 
