1909 | The 1907 Alexander Alaska Expedition. 211 
Astur atricapillus striatulus Ridgeway. Western Goshawk. 
A full-grown male in juvenal plumage (No. 77) was taken 
by Stephens at Bear Bay, on Peril Strait, Baranof Island, Aug- 
ust 25. As compared with a series of eastern birds in correspond- 
ing plumage in the National Museum, it shows deeper rusty 
edgings to the feathers wherever such edgings occur. The whole 
dorsal surface is darker, and the bars across the dorsal surface of 
the tail are conspicuously blacker. 
Buteo borealis alascensis, new subspecies. 
Alaska Red-tailed Hawk. 
CHARACTERS.—Resembling Buteo borealis calurus but smaller 
throughout, and, keeping in consideration the stage of plumage, 
dark areas blacker and more extended. 
Types.—Male adult; No. 51, U. C. M. V. Z.; Glacier Bay, 
Alaska; July 19, 1907; collected by Frank Stephens. Female 
juvenal; No. 41, Coll. U. C. M. V. Z.; Port Frederick, Chichagof 
Island, Alaska; July 28, 1907; collected by Joseph Dixon. 
RemarKks.—I compared the male type with the large series 
of Buteo borealis calurus in the U. S. National Museum collee- 
tion, and found it to be always blackest dorsally, and decidedly 
smaller; the other three specimens of alascensis are at least as 
black and but a little larger. Even in comparison with the 
erythro-melanistie plumage of caluwrus, the dorsum of alascensis 
still stood sootier. The three adults all have relatively broad 
subterminal black bars on the tail, varying from 10 to 16 mm. in 
width. The dorsal surface of the tail is a dark red, between 
hazel and chestnut. In two of the adults there is a series of well- 
defined but irregular and narrow transverse bars within and 
concentrie with the subterminal bar. In the other adults there 
is but an indication of such markings, chiefly along the shafts of 
the rectrices. The flanks are strongly barred with hazel. The 
black shaft streaks in the belt across the middle of the belly in 
all three specimens are much broader than in any specimens of 
calurus I have seen. It must be emphasized that the examples 
of alascensis at hand are not in a plumage that corresponds with 
