THE GENUS CHORDEILES SWAINSON— OBEEHOLSER. 25 



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



Chordeiles virginianus vicinus. 

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



Chordeiles virginianus aserriensis. 

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

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



less numerous Chordeiles virginianus virgimanus. 



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

 more numerous. 

 a" Above darker, the light mottlings less numerous. 



Chordeiles virginianus hesperis. 



(f Above lighter, the light mottjings more numerous. 

 'h\ Dark brown of upper parts more rufescent, the light mott- 

 lings more ochraceous or buffy. 



Chordeiles virginianus howelU. 

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

 lings more grayish or whitish. 



Chordeiles virginianus sennetU. 



<? 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 more buffy or ochraceous. {Females.) 



^\ Size small, the length of wing usually less than 185 mm., averagmg 



le<?s 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 asernensts. 



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.). 



o^ Larger (wing averaging 179.4 mm.) ; posterior lower paris more 



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



color more deeply blackish; the light markings less numer- 



Chordeiles virginianus chapmam. 



r. SmaL7(wi;Va;;7ap';g"l73.2 mm.) ; posterior ^^wev^^tsle^ 



whitish (more ochraceous); upper surface lighter (the 



Lund color less deeply blackish, the light markmgs more 



^ . _ Chordeiles virginianus o^^cinus. 



d' Size iarge!X'length "oVwin'g uTually more than 190 mm., averaging 



e^ ZZr'^ZlTe Tre brownish, the light markings more ochraceous 

 ■ o? tawny ; posterior under surface more buffy or ochraceous 

 f Lowel parts lighter, posteriorily less ochraceous or buffy (more 

 ^ • whitish) ; upper surface U^Mev.-Chordeiles virginianus howellu 

 ^ Tower parts darker, posterioriy more ochraceous or buffy (less 

 ^- wWtish)TuPPer surface darker_.O.orcie«e. virginianus henry^. 



13732°— Bull. 86—14 3 



