180 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



for the tail, less brownish, more like that of B. u. iimhelloides but paler, 

 and less brownish on the interscapulars, back, and upper surface of wings ; 

 the general color of the forehead, crown, occiput, nape, upper back, and 

 upper wing coverts, light neutral gray tinged or mixed with from pale light 

 brownish olive to pale tawny-olive, the head and nape with very little 

 of this brownish wash ; interscapulars with large fuscous to black blotches 

 on the feathers which are otherwise ashy tilleul buff, basally washed with 

 pale ochraceous-tawny ; feathers of lower back, rump, and upper tail 

 coverts snufT brown, tipped, edged, and vermiculated with ashy light 

 neutral gray and with subterminal large tear-shaped tilleul bufif to whitish 

 shaft spots laterally narrowly edged with black and sparingly speckled 

 with the same, rectrices cinnamon-buff to pale clay color, the lateral 

 feathers the palest, the terminal inch pale smoke gray traversed by a 

 broad band of dark dull sepia and sparingly speckled with fuscous, the 

 broad dark band occupying more than half the width of the gray area, 

 and breaking up into a mass of frecklings on the median pair of rectrices ; 

 below as in B. u. umhellus but the barrings more numerous, especial)}^ 

 on the abdomen, and averaging paler — pale ashy huffy drab, and the 

 tarsus more fully feathered. 



Adult (gray phase). — Similar to the brown phase but with the tail 

 feathers smoke gray with no buffy tone ; ventral barrings duskier — light 

 brownish olive darkening to sepia on the sides and flanks. 



Juvenal. — None seen. 



Dozvny young. — None seen. 



Adult male.— Wing 172-191 (181); tail 138-164 (151.8); culmen 

 from base 25.3-28.8 (27.0) ; tarsus 40.3-44.9 (42.6) ; middle toe without 

 claw 35.0-39.9 (37.4) ; unfeathered part of tarsus 12.0-22.5 (17.4 mm.).^^ 



Adult female.— Wing 165-178 (171.5) ; tail 120-147 (133.2) ; culmen 

 from base 25.0-27.8 (26.3) ; tarsus 36.9-44.7 (39.8) ; middle toe without 

 claw 33.2-38.8 (35.0) ; unfeathered part of tarsus 13.8-21.7 (17.3 mm.).8« 



Range. — Subclimax deciduous woodland and thickets (cottonwood and 

 willow communities) chiefly of the Rocky Mountain montane forest 

 (western yellow-pine consociation) of the Transition Zone, but to some 

 extent also in similar subclimax deciduous communities in the upper 

 fringe of the grassland biome of the Upper Austral Zone, east of the 

 Rocky Mountains; from west-central and central-northern Utah, south- 

 eastern Idaho, and central-western Wyoming northeastward across 

 Wyoming and the Dakotas to northeastern North Dakota (Walhalla). 

 Bonasa umhellus incana intergrades with mnbelloides in northwestern 

 Wyoming, and probably also in the intervening areas wherever the species 

 occurs, and in southern Manitoba in the aspen parklands and along 



' Twenty specimens from W^'oming, Utah, North Dakota, and southeastern Idaho. 

 'Eight specimens from Utah, North Dakota, and southeastern Idaho. 



