BIRDS OF NORTH AND MIDDLE AMERICA 619 



d. Breast iinstreaked, light buffy, 



e. Size smaller; wings, male, averaging 240; female 270 ram. (Central 

 America to Argentina) -. -F. femoralis femoralis, ad. (p. 687) 

 ee. Size larger; wing, male, averaging 257; female, 290 mm (southwest 

 United States and Mexico) . 



F. femora-lis septentrionalis, ad. (p. 683) 



dd. Breast streaked with fuscous to fuscous-black. 



e. Size smaller; wing, male, usually under 250; female, under 275 mm. 

 (Central America to Argentina). 



F. femoralis femoralis, juv. (p. 687) 

 ee. Size larger; wing, male, usually over 250; female, over 275 mm. 

 (southwest United States to Mexico). 



F. femoralis septentrionalis, juv. (p. 684) 

 cc. Length of cere on top less than one-third of the length (curve) of culmen; 

 no broad blackish area meeting across upper abdomen. 

 d. Upperparts from crown to rump bluish slate to blackish slate. 

 e. Outer webs of primaries with whitish or pale spots (Great Plains; 

 winters south to northern Mexico) . 



F. columbarius richardsonii, ad. cf (p. 707) 

 ee. No pale spots on outer webs of primaries. 



/. Pale bars or spots on inner webs of primaries usually not reaching 

 edge of feathers (western British Columbia; winters south to 



California) F. columbarius suckleyi, ad. c? (p. 712) 



//. Pale bars or spots on inner webs of primaries usually reaching edge 

 of feathers. 

 g. Top of head and upper part of back darker, slate to blackish 

 slate (eastern half of Canada south to New England; winters 

 south to South America and V/est Indies) . 



F. columbarius colum-barius, ad. cf (p- 691) 

 gg. Top of head and upper part of back lighter, deep neutral gray to 

 slate (northwestern Alaska to Idaho and eastern Oregon; 

 winters south to Mexico, Florida, West Indies). 



F. columbarius bendirei, ad. cf (p. 702) 

 dd. Upperparts not bluish or blackish slate from crown to rump. 

 e. Rump and upper tail coverts with a definite slate tinge. 

 /. Outer webs of primaries with pale spots (Great Plains; winters 

 south to northern Mexico) . 



F. columbarius richardsonii, ad. ? (p. 708) 

 //. Outer webs of primaries with no spots. 



g. Pale marks on inner webs of primaries usually not reaching the 

 edge of the feathers (western British Columbia, winters south 



to Cahfornia) F. columbarius suckleyi, ad. ? (p. 712) 



gg. Pale marks on inner webs of primaries usually reaching the edge 

 of the feathers. 

 h. Dark streaks on underparts of body darker, fuscous (eastern 

 half of Canada to New England; winters to South America 

 and West Indies). 



F. columbarius columbarius, ad. ? (p. 692) 

 hh. Dark streaks on underparts of body paler, sepia (north- 

 western Alaska to Idaho and eastern Oregon; winters 

 south to northern Mexico, Florida, and West Indies). 



F. columbarius bendirei, ad. ? (p. 702) 



