DENDRAGAPUS. 195 
Species. 
a, Tail of 20 feathers; sides of neck in male with a distinct inflatable air-sac; wing 
of male more than 7.00. (Subgenus Dendragapus.) 
Adult male: Above dusky grayish or dull blackish, usually more or less 
mottled, especially on wings (sometimes distinctly and coarsely mottled 
over whole surface) ; tail black, with or without gray terminal band; 
lower parts chiefly plain slate-gray, more or less varied with white on 
flanks, etc.; length about 20.00-23.00, wing 9.40-10.00, tail 8.00, weight 
about 2} to 34 lbs. Adult female: Similar to the male, but decidedly 
smaller and colors much less uniform, the upper parts more or less dis- 
tinctly spotted and barred with buffy or brownish, the chest and anterior 
part of sides similarly marked; length about 17.50-19.00, wing about 
8.70, tail 6.00. Young: Above yellowish brown, the feathers with con- 
spicuous shaft-streaks and terminal triangular spots of white, and rather 
large transverse roundish spots of black; secondaries with broken or 
mottled bands of dusky and white; lower parts dull whitish, the chest 
and sides spotted with black; head buffy whitish, spotted with black on 
crown, and marked along side of head by a dusky stripe. Downy young: 
Above mixed pale chestnut-brown and brownish white, mottled with 
blackish, this forming six rather irregular and indistinct stripes down 
rump, and an indefinite number of more confused stripes on top of head, 
where, however, the mottlings are sometimes broken into irregular 
spots; on side of head behind eye several irregular spots of black; lower 
parts plain dull white. Hggs buff or cream-color, more or less distinctly 
sprinkled or speckled (more rarely spotted) with umber-brown. 
ob. Tail tipped with a distinct ash-gray band. 
c. Lighter colored, with broader tail-band (.50-.80 wide on outermost 
feather), distinct whitish space on side of neck, and throat mostly 
white. Adult male: Above dark slaty, everywhere finely mottled 
with gray and light brownish, the hinder scapulars usually with 
distinct shaft-streaks and terminal spots of white; tail-band 1.00- 
1.50 wide on middle feathers, .50-.80 wide on outermost. £ggs 1.99 
x 1.38. Hab. Rocky Mountains, west to the Wahsatch, south to 
New Mexico and Arizona (White and San Francisco Mountains), 
north to South Pass........ 297. D. obscurus (SAY). Dusky Grouse. 
@. Darker colored, with narrower tail-band (not more than .40 wide on 
outermost feather), no distinct whitish space on side of neck, and 
throat dusky, bordered with white, in adult male. Adult male: 
Above sooty blackish, sometimes nearly uniform, but usually more 
or less mottled with brownish, especially on wings; scapulars usu- 
ally without distinct white streaks or spots; tail-band less than 1.00 
(usually about .60) wide on middle feathers. Adult female much 
darker than in D. obscurus, the upper parts sometimes deeply washed 
with dark rusty. Young: Similar to corresponding stage of D. ob- 
