118 NEW YORK ZOOLOGICAL SOCIETY. 
nelsoni is delimited on the north. No specimens are available 
from San Francisco Mountain, the Grand Cafion, or from west- 
ern Nevada, other than the Grapevine Mountains, nor have we 
any from Lower California or the Seri Mountains. 
Through the courtesy of Dr. C. Hart Merriam, and with the 
valued assistance of Mr. W. H. Osgood, I have been enabled 
to make an examination of the series of ten specimens of Ovis 
nelsoni which have been collected for the Biological Survey in 
the type locality. These specimens were brought into direct com- 
parison with specimens of Ovis montana, and also with a fine 
series of eight skins and skulls, four males and four females, re- 
cently collected for the Survey at Lake Santa Maria, in north- 
ern Mexico. 
Between the two groups of southern specimens and skins of 
Ovis montana from farther north the color differences are strongly 
marked. It is equal to the difference between a brown bear and a 
black one. The following are the points of divergence between 
nelsoni and montana which immediately appeal to the eye, in 
the order named: 
1. The southern specimens are small, and the pelage of all is 
short, stiff, and harsh. 
2. The general color is totally different from that of Ovis mon- 
tana, and difficult to describe. It is a pale salmon gray, the 
pelage having the appearance of being suffused with a warm, 
pinkish, sunset glow. This applies to skins collected in July, but 
which even then retained what appeared to be their winter pelage. 
The weathered and dingy-looking rump patch is blended so 
closely with the color of the body and hindquarters as to be but 
slightly noticeable. 
3. The tail is so thinly haired, so long (three inches), and 
so small that it strikingly resembles the almost naked tail of a 
pig-tailed macaque monkey. If this character proves to be con- 
stant, it is of itself sufficient for the identification of the south- 
ern species. 
4. The forehead of Ovis nelsoni (and also that of the speci- 
mens from Lake Santa Maria) is by no means so deeply concave 
as that of Ovis montana. 
5. The shortness of the (molar) tooth-row in nelsoni, and the 
small size of the molars generally, clearly distinguish this species. 
It seems safe to assume that the sheep isolated on the penin- 
