82 University of California Publications in Zoology [Vou 30

of the species Dendragapus fuliginosus in southeastern Alaska to its
southern limit at Mt. Pinos, California, there is a steadily increasing
degree of graduation in the tail. The same sort of geographical
variation (that is, shape of tail) is seen to some extent in the richard-
soni group. Flemingi and richardsonii are alike in possessing square-
tipped tails, but the more southern form, obscurus, has the tail slightly
rounded.

Fig. F. Tails of Dendragapus fuliginosus sierrae and D. f. howardi; about 4
natural size. a, D. f. sierrae, adult male (M.V.Z. no. 5082); b, D. f. sierrae, adult
female (M.V.Z. no. 14069); c, D. f. howardi, adult male (coll. D. R. Dickey,
no. K-240); d, D. f. howardi, adult female (coll. D. R. Dickey, no. J-881).

In the more southern subspecies of the fuliginosus group the gray
terminal tail band is notably broader than in the northern races. In
the southern obscurus, again, this feature is prominently developed, in
contrast to conditions in the more northern richardsonwi and flemingi,
where it is all but absent.