78 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



band usually broader (20-30 mm.) and speckled with blackish; under- 

 parts averaging slightly paler than in fidiginosus, chin and upper throat 

 averaging slightly more whitish than in the latter ; "naked skin above and 

 below eye light orange ; iris hazel brown ; bill dusky . . . feet light 

 gray or olive drab . . . nails dusky" (ex Grinnell, Bryant, and Storer) ; 

 hooting sacs said to be orange, large, and carunculated during the breed- 

 ing season. 



Adult female. — Similar to the corresponding state of Dendragapus 

 obscurus fuliginosus but more grayish, less brownish above and below, 

 much paler on the abdomen, the gray terminal tail band averaging broader. 



Immature male. — Similar to the adult male but differs in having nar- 

 rower rectrices, and often some juvenal inner secondaries and head 

 feathers. 



Immature female. — Differs from the adult of its sex in the same way 

 as the immature male differs from the adult. 



Juvenal (sexes alike). — Very similar to that of Dendragapus obscurus 

 fuliginosus, but the feathers of the upperparts more tipped with grayish, 

 and the light brown areas of these feathers paler and slightly grayer — 

 grayish avellaneous to grayish light buffy brown. 



Downy young. — Similar to that of D. o. fuliginosus but paler, especially 

 on the sides of the head, chin, throat, and underparts of the body, which 

 are between ivory yellow and Marguerite yellow.'^^ 



Adult malc.—Wmg 196-248 (226.5); tail 136-181 (160.5); exposed 

 culmen 18.8-23 (20.7) ; tarsus 40.2-45 (42.5) ; middle toe without claw 

 39.7-46.6 (43.3mm.).''9 



Adult female.— \Wmg 199-234 (209.4) ; tail 118-143 (127.5) ; exposed 

 culmen 17.4-22.9 (19.8); tarsus 36.6-41.4 (38.9); middle toe without 

 claw 34.5-41.8 (38.2 mm.).*" 



Range. — Resident in Canadian and Upper Transition Zone evergreen 

 forests from central-southern Washington (Husum), and the southern 

 Cascade Mountains and the Warner Mountains, Lake and Klamath 

 Counties, Oreg., to northern California from Modoc County, Lassen 

 County, Shasta County, and Trinity County to Eldorado County, Cala- 

 veras County, and Madera County, and to adjacent western Nevada 

 (Washoe County, Ormsby County, Esmeralda County; Sierra Nevada 

 and White Mountains). 



Type locality — Echo, El Dorado County, Calif. 



Tetrao obscurus (not of Say) Newberry, Rep. Pacific R. R. Surv., vi, 1857, 90, 

 part (Sierra Nevada). — Bridges, Proc. Zool. Soc. London, 1858, 1 (Sierra 

 Nevada 4,000-6,000 feet ; Trinity Mountains ; Yosemite Valley, near headwaters 

 of Merced River). — Sclater, Proc. Zool. Soc. London, 1858, 1 (Trinity Moun- 



"* None seen in the present study ; this description based on Moffitt's excellent col- 

 ored plate (Auk, Iv, 1938, pi. 19, opp. p. 589). 

 "Three specimens from Oregon and California. 

 " Fourteen specimens from southern Washington, Oregon, and California. 



