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THE GENUS CHOEDEILES SWAINSON OBERHOLSER. 25 



g^. Smaller (wing usually less than 176 mm.) ; upper parts darker. 



Chordeiles virginiantis vicinus. 

 g'. Larger (wing usually more than 180 mm.) ; upper parts lighter. 



Chordeiles virginiamis aserriensis. 

 e'. Larger (wing usually more than 192 mm.). 

 f. Upper surface darker, more blackish, the light mottlings much 



less numerous Chordeiles virginiamis virginianus. 



f. Upper surface lighter, more brownish, the light mottlings much 

 more numerous. 

 ^. Above darker, the light mottlings less numerous. 



Chordeiles virginianus hesperis. y 

 g^. Above lighter, the light mottlings more numerous. 



7^^ Dark brown of upper parts more rufescent, the light mott- 

 lings more ochraceous or buffy. 



Chordeiles virginianus howelli. 

 h'. Dark brown of upper parts more grayish, the light mott- 

 lings more grayish or whitish. 



Chordeiles virginianus sennetti. 

 c*. Smaller; alar speculum smaller, and more or less mottled with dusky; 

 white subterminal bar on tail absent or very narrow ; gular crescent 

 buff or ochraceous; lower parts moi-e buffy or ochraceous. (Females.) 

 d^. Size small, the length of wing usually less than 185 mm., averaging 

 less than 183 mm. 

 e\ Upper surface paler (the ground color lighter and the light mark- 

 ings lighter or much more numerous) ; lower parts lighter; pos- 

 terior lower surface less heavily barred. 



Chordeiles virginianus aserriensis. 

 e'. Upper surface darker (the ground color darker, and the light mark- 

 ings more deeply colored or much less numerous) ; lower parts 

 darker; posterior lower surface more heavily barred. 

 f. Lower parts and light markings of upper surface more tawny or 

 ochraceous; size smaller (wing averaging 168.7 mm.). 



Chordeiles virginianus minor, 

 f. Lower parts and light markings of upper surface more grayish or 

 whitish; size larger (wing averaging over 172 mm.). 

 g^. Larger ( wing averaging 179.4 mm. ) ; posterior lower parts more 

 whitish (less ochraceous) ; upper surface darker (the ground 

 color more deeply blackish, the light markings less numer- 

 ous) Chordeiles virginianus chapmani. 



ff. Smaller (wing averaging 173.2 mm.) ; posterior lower parts less 

 whitish (more ochraceous) ; upper surface lighter (the 

 ground color less deeply blackish, the light markings more 



numerous) Chordeiles virginianus vicinus. 



d'. Size large, the length of wing usually more than 190 mm., averaging 

 more than 188 mm. 

 e^. Upper surface more brownish, the light markings more ochraceous 

 or tawny ; posterior under surface more buffy or ochraceous. 

 f. Lower parts lighter, posteriorily less ochraceous or buffy (more 

 whitish) ; upper surface lighter — Chordeiles virginianus howelli. 

 f. Lower parts darker, posteriorly more ochraceous or buffy (less 

 whitish) ; upper surface darker — Chordeiles virginianus henryi. 

 13732°— Bull. 86—14 3 



