148 THE CONDOR Vol. XXII 
Jess numerous; the black areas often tend to coalesce. The bare red skin above the eye 
is brighter and more conspicuous than in the female. 
Adult male in postnuptial plumage: One specimen (no. 269376, U. S. Nat. Mus., 
Biol. Surv. coll.) collected September 26, 1919, is rapidly acquiring the white winter 
plumage. Scattered black feathers from the summer plumage, much worn, still remain, 
but the handsome fall feathers (ground color light buff to warm buff, exquisitely dotted 
and pencilled with blackish) occupy most of the back, rump, and breast. 
The period during which the postnuptial plumage is worn must be short. The 
earliest appearance of fall feathers in the series from Rainier is August 10, as exempli- 
fied in a female bird (no. 156505, U. S. Nat. Mus., Biol. Surv. coll.) which is acquiring 
a few transitional feathers. In a male collected September 26 (no. 269376, U. S. Nat. 
Mus., Biol. Surv. coll), the fall plumage is being rapidly replaced by the immaculate 
white plumage of winter 
Adult females in nuptial plumage: As in the males, the plumage shows evident 
signs of wear. Upperparts heavily mottled with black, the feathers. variously spotted 
and barred with light buff to ochraceous-buff, and edged and sometimes spotted or 
barred with white. Underparts white, more or less extensively washed with pale buff; 
breast and sides heavily barred with black, the flanks and mid-belly also with scattered 
barred feathers. Throat white, sparsely spotted with dark brown. Wings and tail white. 
Adult females in postnuptial plumage: No specimens fully exemplifying this 
stage are at hand from Mount Rainier. One bird (no. 156505, U. S. Nat. Mus., Biol. Surv. 
coll.) taken August 10, 1897, is acquiring feathers of this plumage, which approximate 
light ochraceous-buff or ochraceous-buff in color, thus being a shade darker than in the 
fall male described above. 
Young, transition from natal to juvenal plumages: A series of four specimens 
(nos. 156494-156497, U. S. Nat. Mus., Biol. Surv: coll.) taken by Dr. A. K. Fisher on Mount 
Rainier July 31 to August 2, 1897, exemplify an early stage of plumage All are begin- 
ning to acquire feathers of the juvenal plumage, but, excepting the wings and scapulars, 
and in some the tail, the natal down still covers the entire body. In two (nos. 156495, 
156497) the juvenal feathers are just appearing on the tail; all have them barely started 
in the scapular area, longer in one (no. 156497). 
Down of upperparts colored as follows: top of head cinnamon or sayal brown, in 
one (no. 156494) modified by blackish; sayal brown area inclosed by black line; back 
with broad lengthwise area of sayal brown, bordered and often modified by blackish; in 
one (no. 156497) the brown area is finely cross-barred with black; a median black line, 
bordered by pale smoke gray, connects the coloration of the top of the head with that of 
the back; shoulders and underparts pale smoke gray, the breast lightly washed with 
buffy, and flanks and belly with suggestions of buffy; face white, crossed by two or 
three distinct black bars, one extending backward from nostril and eye, one from corner 
of mouth, and one from below corner of mouth; two black spots (fused in some speci- 
mens) above nostrils; natal down of wings anteriorly sayal brown, variously modified 
by black; feet and legs pale smoke gray, with suggestions of buffy; incoming scapulars 
(juvenal plumage) fuscous black, tipped with wedge of white, and modified with warm 
buff; wings (juvenal plumage) deep mouse gray; the feathers tipped with white, and, 
particularly the secondaries and coverts, edged and otherwise modified with buffy; bill 
black, tipped with cream buff or whitish. 
Measurements.—Four adult males of Lagopus leucurus rainierensis measure as fol- 
lows: Wing, 181.5 mm. (187-176); tail, 99.5 (106-96); culmen, 15.5 (16.0-14.5); depth of 
upper mandible, 6.3 (6.6-6.0). Four adult females: Wing, 175.7 (182-171); tail 86.7 (90- 
82); culmen, 15.2 (16.5-13.5); depth of upper mandible, 6.2 (6.4-6.1). 
On comparison of these measurements with those published by Riley for Lagopus 
leucurus peninsularis from the Kenai Mountains, it will be observed that the Rainier 
specimens are longer-winged on the average; the wings and tails of the series of L. l. rai- 
nierensis are nearly the same as in specimens of L. 1. leucurus from Alberta and British 
Columbia, but average less than in examples of L. 1. altipetens from Colorado. 
Remarks.—The type locality of the new subspecies is near the southern ex- 
tremity of the geographic range of the species in the major Pacific Coast moun- 
tain chain. Comparison with specimens of Lagopus leucurus leucurus from 
