1906.] NATURAL SCIENCES OF PHILADELPHIA. 181 



d\ — Larger (wing 114-124 mm.)- 



e.— Lower surface with distinct blackish shaft lines ; 

 light rump band with dark shaft lines very 

 conspicuous. 

 /.—Upper and lower parts much paler; light 

 rump band more conspicuous, 



Collocalia francica germani. 

 f\ — Upper and lower parts much darker; light 

 rump band less conspicuous, 



Collocalia francica inexpectata. 



gi .—Lower surface without distinct blackish shaft 



lines; light rump band with dark shaft lines 



almost obsolete. 



/.—Upper surface with little or no greenish gloss ; 



rump band more brownish ; posterior lower 



parts darker, 



Collocalia francica spodiopijgia. 



/I. —Upper surface with a distinct greenish gloss ; 



rump band more whitish; posterior lower 



parts paler, Collocalia francica townsendi. 



a\—At least the middle of abdomen white, in sharp contrast to the 



gray breast. 



h. — Rump with a white band. 



c— Rectrices with white spots; white rump band without 



blackish shaft lines, . . . Collocalia uropygialis. 



ci.— Rectrices without white spots; white rump band with 



conspicuous blackish shaft lines, Collocalia troglodytes. 



b^. — Rump without a white band. 



c. — Rectrices wath white spots. 



^.— Upper surface brighter and more bluish or purplish ; 

 rump, wing-quills, and wing-coverts without light 



grayish tips, Collocalia escidenta. 



rfi.— Upper surface duller and more greenish; rump, 

 wdng-quills, and wing-coverts with light grayish 

 tips. 

 g.— White spots on tail-feathers sharply defined ; chm 

 and upper throat paler; blackish shaft-mark- 

 ings of short lower tail-coverts smaller, 



Collocalia neglecta. 

 gi.— Wiiite spots on tail-feathers not sharply defined ; 

 chin and upper throat darker ; blackish shaft- 

 markings of short lower tail-coverts larger, 



Collocalia natalis. 

 c^ — Rectrices without white spots. 



f/.— Feathers of rump with broad white edgings, 



Collocalia marginata. 

 f^i.— Feathers of rump without white edgings. 



g._\Ving less than 95 mm.; upper surface much 

 duller, Collocalia dodgei. 



