24 BULLETIN 86, UNITED STATES NATIONAL MUSEUM. 



d'. Size greater (wing averaging more than 180 mm.). 



Chordfeiles acutipennis temensis. 

 d'. Size smaller (wing averaging less than 178 mm.), 

 e". Lower parts darlier, more heavily barred. 



ChordeUes acutipetmis acutipennis. 

 e". Lower parts lighter, less heavily barred. 

 f. Smaller (wing averaging under 160 mm.) ; pale bars on under 

 side of tail more whitish; light bars on posterior lower parts 



averaging wider Chordeiles acutipennis exilis. 



f. Larger (wing averaging over 165 mm.) ; pale bars on under side 

 of tail more buffy or ochraceous ; light bars on posterior lower 

 parts averaging narrower. 

 tr*. Light bars on tail broader ; size averaging larger. 



ChordeUes acutipennis inferior, 

 g'. lAght bars on tall narrower ; size averaging smaller. 



Chordeiles acutipennis rmcromeris. 

 c". Smaller; wing speculum smaller, and bu£E or largely so; no white sub- 

 terminal bar on tail; throat-patch buflf or ochraceous. (Females.) 

 d\ Large (wing usually more than 174 mm., averaging over 170 mm.). 



Chordeiles acutipennis texensis. 

 d'. Small (wing usually less than 168 mm., averaging under 170 mm.), 

 e'. Above darker; lower surface darker and posteriorly more heavily 



barred; size smaller Chordeiles acutipennis acutipennis. 



e'. Below paler; lower surface lighter and less heavily barred; size 

 greater. 

 f. Larger (wing averaging more than 166 mm.) ; light bars on taU 



broader Chordeiles acutipennis inferior. 



f. Smaller (vrtng averaging less than 163 mm.) ; light bars on tail 

 narrower. 

 g\ Posterior lower parts darker; size greater. 



Chordeiles acutipennis micromeris. 

 g'. Posterior lower parts lighter ; size smaller. 



Chordeiles acutipennis exilis. 

 6". White or buffy patch on usually 5 outer primaries situated between the 

 tips of the seventh and tenth primaries ; primary coverts and outer webs 

 of primaries and of secondaries without spots or bars of buff or ochrace- 

 ous, or with at most faint markings; first primary usually longer than 

 second. (Chordeiles virginianus.) 

 &. Larger ; alar speculum larger, and plain white without dusky markings ; 

 a white subterminal bar on tail; gular crescent pure white; lower 

 parts less buffy. (Males.) 

 d\ Light mottlings of upper surface deeply tawny. 

 e*. Posterior lower parts paler, more buffy or whitish; upper surface 

 lighter; size larger (wing averaging 199.7 mm.). 



Chordeiles virginianus henryi. 

 e'. Posterior lower parts darker, more ochraceous or tawny; upper 

 surface darker; size smaller (wing averaging 168 mm.). 



Chordeiles virginianus minor, 

 d' Light mottlings of upper surface ochraceous buff or white. 

 e*. Smaller (wing usually less than 188 mm.). 

 f. Upper surface darker, the pale mottlings much less numerous. 



Chordeiles virginianus ehapmani. 

 f. Upper surface lighter, the pale mottlingB much more numerous. 



