96 THE DEER OF AMERICA. 
minal black switch, whereas on the mountain or more eastern 
variety no such colored line is found, but all is white quite down 
to the persistent black hairs of the terminal tuft. This tuft is 
present alike on both varieties, and so on both is the underside of 
the tail naked, a peculiarity found on no other species of deer. 
The enormous metatarsal gland peculiar to this species is found 
alike on both varieties. Altogether there is a greater difference 
between these two varieties of a clearly identical species, than I 
have observed in any other species of this family in the wild 
state. 
Black-tailed Deer. 
