1926] Swarth: Birds and Mammals from the Atlin Region 105

adults and young, and these differences are fairly well correlated with
certain regions. The specimen just described (as well as another
similar bird collected by Brooks) shows that differences of coarse or
fine markings cannot be explained as different stages reached by the
same individual.

The last goshawk was seen by me near Atlin, September 19, but it
seems likely that the species remains to a later date.

Buteo borealis harlani (Audubon). Harlan Hawk

I collected in the Atlin region six specimens (nos. 44730-44735)
of a dark-colored Buteo that was of fairly common occurrence there.
The series consists of one adult female, three young males, and two
young females. Two of the young birds are just out of the nest, partly
feathered and not able to fly any distance, the other three are full
grown. In addition, Brooks collected an adult female and one young
bird. There are at hand also two specimens loaned by the Provincial
Museum, Victoria. Both are from the Atlin region, an adult female
(Prov. Mus. no. 2664) taken at Wilson Creek, June 19, 1914, an imma-
ture bird (Prov. Mus. no. 2666) from Blue Canon, August 18, 1914.
The first mentioned has been recorded as Buteo swainsoni (Anderson,
1915, p. 12), the second as Buteo borealis alascensis (Anderson, loc.
Clitoy TOs LUL)\e

The two adult females collected by Brooks and myself, both in
worn plumage and just beginning the annual molt, are essentially
alike. They are uniformly dark-colored, almost sooty, and in each
there are white markings at the base of the feathers that show through
more, probably, than they would in fresh plumage. New feathers
coming in are darker, more sooty, than the old, worn plumage.

In Brooks’ specimen the tail is mostly dark, with scarcely a trace
of red, it is mottled longitudinally with whitish, and there is a sub-
terminal band of blackish. There are two aberrant rectrices. One
has the inner web mostly white; the other is broadly barred with
dusky, there is a sharply defined triangular white spot at the tip of
the outer web, and the subterminal dusky band is broader than on the
other feathers.

In the adult female taken by myself the exposed portions of the
rectrices are dusky, mottled longitudinally with whitish and with dark
markings, and there is a good deal of reddish on the terminal fourth