82 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



WiLLETT, Pacific Coast Avif., No. 21, 1933, 48 (sw. California; nest and eggs. 

 Mount Pinos).— MoFFiTT, Auk, Iv, 1938, 589, pi. 19, fig. 3 (downj-, j'oung, 

 descr. ; col. fig.). 

 D[endragapiis] f[uliginosus] hozvardi Swakth, Univ. California Publ. Zool., xxx, 

 1926, 74 in text (map, distr.), 82 in text (fig. of tail feathers). 



DENDRAGAPUS OBSCURUS RICHARDSONII (Douglas) 



Richardson's Grouse 



Adult male. — Similar to that of Dendragapus obscunis sitkensis but 

 lacking the gray terminal band on the tail feathers (or, at most, with 

 this band so dark as to be hardly distinct from the rest of the feathers), 

 the rectrices more truncate terminally, the tail outUne squarer, and with 

 more whitish on the chin and throat ; the cervical air sacs, or hooting 

 sacs, are smaller and deep purplish, instead of yellow as in the coastal 

 forms, and its skin is not thickened and carunculated in the present form ; 

 iris bister ; "comb" deep yellow ; eyelid dull greenish yellow ; bill blackish ; 

 feet brownish gray. 



Adult female. — Similar to that of D. o. sierrae but much darker above, 

 the broad dark bars and bands being dark fuscous to fuscous-black (as 

 against dark sepia to clove brown in sierrae), with no gray terminal 

 band on the tail, and the breast and abdomen slightly duskier; iris hazel 

 brown ; "comb" deep dull yellow ; bill grayish black ; the lower mandible 

 yellowish flesh color basally; feet horn gray, claws brown. 



Immature male. — Like the adult but with narrower rectrices, the tail 

 less squarish, more graduated; and with occasional juvenal feathers on 

 the head and nape and inner edge of wing. 



Immature feiiwlc. — Differs from its adult in the same way that the 

 immature male does from its corresponding adult state. 



Juvenal (sexes alike). — Similar to that of D. o. sierrae but much darker, 

 less tawny ; the general dorsal coloration Saccardo's umber to cinnamon- 

 brown (instead of ochraceous-tawny as in sierrae) and the dusky vermicu- 

 lations and black bars more conspicuous. 



Downy young. — Similar to that of D. o. sierrae, but with the forehead, 

 superciliaries, and breast and abdomen whitish instead of buffy; chin and 

 upper throat washed vv^ith pale buffy. 



Adidt male.—Wmg 201-241 (224.5) ; tail 134-176 (158.2) ; exposed 

 culmen 18.3-22.6 (20.9) ; tarsus 41-47.8 (44.7) ; middle toe without claw 

 39.1-45.1 (41.8 mm.). 85 



Adidt female.—Wmg 193-224 (207.9) ; tail 121-147 (133.7) ; exposed 

 culmen 17.4-21.9 (19.4) ; tarsus 38.2-44 (40.9) ; middle toe without claw 

 36-43.3 (38.4 mm.).^^ 



*° Twenty-seven specimens from Mackenzie, British Columbia, Alberta, Idaho, 

 Montana, and Wyoming. 



" Thirty-five specimens from Mackenzie, British Columbia, Alberta, Idaho, Mon- 

 tana, and Wyoming. 



