302 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



i. Lesser wing-coverts more deeply and uniformly vinaceous-cinna- 

 mon. 

 j. Larger (wing 91-96.5, averaging 94.8); general c<ilor of nppcr 

 parts more grayish brown. 



Otocoris alpestris chrysolaema. adult female (p. 319) 



jj. Smaller (wing 87-90.5, averaging 89.3); general color of upper 



parts morebu ffy. Otocoris alpestris oaxacae, adult female (p. 323) 



ii. Lesser wing-coverts less deeply or uniformly vinaceous or cinna- 



momeous. 



j. Sides of neck and sides of breast strongly vinaceous, with very 



indistinct, if any, streaks. 



Otocoris alpestris diaphora. adult female (p. 313) 

 jj. Sides of neck and sides of breast very faintly, if at all, vinaceous, 

 the latter distinctly streaked. 

 k. Darker, more olivaceous, with streaks on lower back darker 

 and broader; sides and flanks deeper brown, more dis- 

 tinctly streaked . Otocoris alpestris actia, adult female (p. 320) 

 hk. Paler, more buffy, with streaks on lower back narrower and 

 less dusky; sides and flanks paler brown, less distinctly 

 streaked.. Otocoris alpestris aphrasta, adult female (p. 320) 

 hli. Tlu'oat i^aler yellow or yellowish white; sides and flanks palei 

 brown or cinnamomeous. 

 i. Upper parts more buffy. 

 j. Throat decidedly yellow. 



k. Paler; sides and flanks very pale cinnamomeous, not dis- 

 tinctly, if at all, streaked. 



Otocoris alpestris leucansiptila, adult female (p. 327) 

 kk. Darker; sides and flanks deeper cinnamomeous or buffy 

 brown, more or less distinctly streaked. 



I. Sides and flanks more buffy brown. 



m. Larger (wing 95-103, averaging 98.8). 



Otocoris alpestris occidentalis, adult female (p. 324) 

 mm. Smaller (wing 90-96, averaging 92.6). 



Otocoris alpestris ammophila, adult female (p. 321) 



II. Sides and flanks cinnamomeous. 



Otocoris alpestris adusta, adult female (p. 325) 

 jj. Throat white, or yellowish white. 

 ' Otocoris alpestris leucolaema, adult female (p. 309) 



ii. Upper parts grayer (throat white, or yellowish white). 



Otocoris alpestris enthymia, adult female (p. 308) 

 dd. Wing averaging 101 mm. or more. 



e. Superciliary stripe yellow, like throat; color of upper parts browner. 



Otocoris alpestris alpestris, adult female (p. 304) 

 ee. Superciliary stripe white; color of upper parts grayer. 

 /. Color of upper parts slightly l^rowner; throat yellowish white. 



Otocoris alpestris hoyti, adult female (p. 306) 

 ff. Color of upper parts slightly grayer; throat white. 



Otocoris alpestris arcticola, adult female (p. 307) 

 , aa. L'pper parts speckled. (Young.a) 



b. Underparts yellowish Otocoris alpestris alpestris, young (p. 304) 



bb. Under parts white. 



a The key to the young is necessarily incomplete, several of the forms being unrepre- 

 ented in this plumage in the material examined. 



