620 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



ee. Rump and upper tail coverts not tinged with slate. 



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

 south to northern Mexico). 



r. cclumbarius richardsonii, juv. cT (p- 708) 

 ff. Outer webs of primaries with no spots. 



g. General tone of upperparts very dark, fuscous-black (western 

 British Columbia; winters south to California). 



F. columbarius suckleyi, juv. (p. 712) 

 gg. General tone of upperparts paler, dark sepia to fuscous: 

 Eastern half of Canada to New England. 



F. columbarius columbarius, juv. (p. 693) 

 Northwestern Alaska to Idaho and eastern Oregon. 



F. columbarius bendirei, juv. (p. 702) 

 bb. Inner toe without claw extending beyond penultimate phalanx of middle toe. 

 c. Median tail feathers crossed by only one bar, a broad subterminal one, 

 otherwise uniformly colored. 

 d. Rectrices pale bluish gray (Eurasia; accidental in Massachusetts). 



F. tinnunculus tinnunculus, ad. cT (p. 716) 

 dd. Rectrices hazel-brown. 



c. No black spots on sides of median tail feathers, shafts brown. 

 /. With a patch of hazel on crown. 



g. Dark spots on underparts confined to sides (southeastern United 



States) F. sparverius paulus, ad. cT (p. 740) 



gg. Dark spots on underparts not confined to sides. 



h. Larger; wing 174-198 (186 mm.) (Alaska, Canada, United 

 States except southeastern States). 



F. sparverius sparverius, ad. cf (p. 72 

 hh. Smaller; wing 163-178 (169 mm.) (northwestern Mexico). 

 F. sparverius peninsularis, ad. cf' (p. 74 

 //. Usually with no hazel crown patch. 



g. Underparts usually plain, not spotted with blackish. 

 h. Larger; wings 180-194 (183 mm.) (Hispaniola). 



F. sparverius dominicensis, ad. cf (p. 751) 



hh. Smaller; wings 168-185 (173 mm.) (Cuba and Isle of Pines). 



F. sparverius sparverioides, ad. cT (p. 743) 



gg. With black spots on the breast and upper abdomen (southern 



Mexico, Guatemala, Honduras). 



F. sparverius tropicalis, ad. cf (p. 743) 

 ee. Shafts of median rectrices black; sides of feathers with black spots 

 (Puerto Rico and Lesser Antilles). 



F. sparverius caribaearum, ad. cT (p. 748) 

 cc. Median tail feathers crossed by 10 or more dark bars. 

 d. Top of head rufescent like the back. 



e. The dark bars on the scapulars narrower than the rufescent inter- 

 spaces (Eurasia; accidental in Massachusetts). 



F. tinnunculus tinnunculus, ad. 9 (p. 717) 

 ee. The dark bars on the scapulars as broad as the rufescent interspaces 

 (Eurasia; accidental in Massachusetts). 



F. tinnunculus tinnunculus, juv. (p. 718) 

 dd. Top of head grayish. 



e. The underparts sparsely and lightly streaked. 

 /. Larger; wings 180-195 (189 mm.) (Hispaniola). 



F. sparverius dominicensis, ad. ? (p. 751) 



