BIRDS OF NORTH AND MIDDLE AMERICA 147 



gg. Banding on upper surface of tail sharply defined. 

 h. Abdomen mainly white. 



i. Tibiae nearly white, with only narrow rusty bars; no white 

 spots on the tertials (Cuba). 



A. striatus fringilloides, adult (p. 200) 



ii. Tibiae broadly barred, or uniform, rusty; large concealed 



white spots on the tertials. 



j. Dark bands on tail more than half as wide as the paler 



interspaces; upperparts very dark; head hardly darker 



than the upper back (Puerto Rico). 



A. striatus venator, adult (p. 201) 



jj. Dark bands on tail about half the width of the paler 



interspaces; upperparts paler; head distinctly darker 



than the upper back. 



k. Breast, sides, and thighs plain light brick red (New 



Mexico — Chihuahua border south to Jalisco and 



Veracruz) A. striatus suttoni, adult (p. 195) 



kk. Breast, sides, and thighs marked with ochraceous- 

 tawny or brownish (northwestern Alaska, eastward 

 to Quebec and Newfoundland, south to Baja 

 Cahfornia, Texas, the Gulf coast, and northern 



Florida) A. striatus velox, adult (p. 184) 



A. striatus perobscurus, adult (p. 197) 

 hh. Abdomen barred with rusty. 



i. Cheeks rusty brown with distinct fine dark shaft streaks 

 (northwestern Alaska, eastward to Quebec and Newfound- 

 land, south to Baja California and northern Mexico, 

 Texas, Gulf coast to northern Florida). 



A. striatus velox, adult (p. 184) 

 A. striatus perobscurus, adult (p. 197) 

 n. Cheeks bright rusty, with indistinct shaft streaks (Europe, 

 east to Russia, south to the Mediterranean). 



A. nisus, c? adult (extralimital) 

 //. Cheeks not rufescent. 



g. Cheeks black and white A. collaris, adult (extrahmital) 



gg. Cheeks tawny, streaked with dusky (Nicaragua to Colombia). 

 A. superciliosus fontanieri, immature (p. 182) 

 ee. Underparts undulated or streaked with brown. 

 /. Underparts undulated with brown. 



g. Smaller (wing under 170 mm.) (Cuba). 



A. striatus fringilloides, immature ^* (p. 200) 

 gg. Larger (wing over 180 mm.). 



A. nisus, (f immature (extralimital) 

 ff. Underparts streaked with brown; tibiae variously spotted. 



A, striatus velox, immature (p. 185) 

 cc. Tail decidedly, or at least, distinctly rounded. 

 e. Tail distinctly but not very greatly rounded. 

 /. Smaller, wing under 220 mm. (s. Canada to n. Mexico). 

 A. cooperii, d^ (p. 167) 



^* No immature specimens of A. striatus striatus or of A. striatus venator have 

 been available for study, but probably they would be difficult, if not impossible, 

 to tell from corresponding specimens of A. striatus fringilloides. 

 839094 — 50 11 



