DENDRAGAPUS. 195 



Species. . 



a 1 . Tail of 20 feathers ; sides of neck in male with a distinct inflatable air-sac ; wing 

 of male more than 7.00. (Subgerms 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 3 Jbs. 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. Eggs buff or cream-color, more or less distinctly 

 sprinkled or speckled (more rarely spotted) with umber-brown. 

 6 1 . Tail tipped with a distinct ash-gray band. 



c 1 . 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. Eggs 1.94 

 X 1-39. Hob. Eocky Mountains, west to the "Wahsatch, south to 

 New Mexico (San Francisco Mountains) and Arizona (White Moun- 

 tains), north to South Pass. 



297. D. obscurus (SAY). Dusky Grouse. 



c 2 . 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 



