242 University of California Publications in Zoology. \Vou-5 
streaked black on a white ground. Some hazel in malar region. 
Whole lower surface from behind throat to anal region, inelud- 
ing sides and under wing-coverts, clear deep brown of a shade 
between hazel and chestnut. Anal region abruptly white and 
erissum mainly white, the fuscous bases showing through, giving 
a clouded effect. Wing, 130; tail, 97; eulmen, 19.2; tarsus, 32. 
Juvenal female (No. 160): heavily black-spotted dorsally on 
a sepia ground; on top of head the spots coalesce into an almost 
solid sooty eap which extends down over sides of head; wings 
and tail blackish, sepia-edged, none of the tail feathers with a 
trace of white tipping. Scapulars showing shaft-lines of tawny- 
white, with wedge-shaped tawny markings on lesser wing coverts. 
Chest and anterior belly heavily spotted with black, sharply con- 
trasted anteriorly against a tawny ochraceous ground, this shad- 
ing posteriorly into a deep tawny, almost hazel in the abdominal 
region. Anal region and erissum mottled dusky and whitish; 
throat dull white, sparsely flecked with black. 
Remarks.—The series of fifteen skins consists of nine from 
Admiralty Island (Nos. 139, 140, 261-267), three from Chichagof 
Island (Nos. 158-160), one from Baranof Island (No. 148), and 
two from Glacier Bay (Nos. 240, 251). The adult males are 
quite uniform in depth of coloration, the main point of variation 
being the extent to which the lower surface posteriorly is scaled 
with white. It is probable that the oldest or most vigorous males 
are freest from white scalings. Two of the specimens (Nos. 139, 
140) are practically solid color from throat to anal region, with 
no white interruptions. Two males (Nos. 261, 265) have not a 
trace of white tippings at the ends of the rectrices. Two males 
(Nos. 139, 148) have broader white tippings on inner webs of 
outer rectrices than in the type, but not nearly so much so as in 
examples of migratorius from northern Alaska (Kowak River). 
The female from Glacier Bay (No. 251, July 8) shows a curious 
mixed pattern: the left-hand two outer rectrices are shortest and 
have broad white tippings, including both webs, and about as 
extensive as in average eastern females: but on the right-hand 
side the outermost rectrix is narrowly tipped with white about 
like the average of caurinus, and the feathers are of normal 
length. This specimen might be reasonably considered a hybrid, 
