BIKDS OF NORTH AND MIDDLE AMEEIOA. 47 



c. Paler, with scapulars and interscapulars distinctly margined with pale 



grayish buHy; chin and upper throat more or less spotted with white. 



Fetroohelidon Innifrons Innifrons, young (p. 47 )« 



Fetrochelidon Innifrons tachina.'z 



cc. Darker, with scapulars and interscapulars not distinctly if at all margined 



with paler; chin and upper throat chestnut, without white spots. 



Fetrochelidou Innifrons melanogaster, young (p. 51) 



66. Rump deep cinnamon-rufous or chestnut; throat pale vinaceous-cinnamon or 



cinnamon-buff, without admixture of dusky. (Petrochelidon falva, young.) 



c. Larger and less deeply colored, the throat whitish, the sides less strongly 



rufescent Petrochelidon fnlva fnlva, young (p. 53) 



cc. Smaller and deeper colored, the throat pale vinaceous-cinnamon. 



Petrochelidon fnlva poeciloma, young (p. 54) 



PETROCHELIDON LUNIFRONS LUNIFRONS (Say). 

 CLIFF SWAIIOW. 



Adults {sexes alike). — Forehead dull white, dull pale ecru drab or 

 pale wood brown, forming a conspicuous patch, very sharply defined 

 posteriorly, its extremities pointed; crown and occiput glossy blue- 

 black; hindneck hair brown or brownish gray; back and scapulars 

 glossy blue-black, the former streaked with pale gray or whitish; 

 rump light cinnamon-rufous; upper tail-coverts brownish gray or hair 

 brown with paler margins; wings and tail dusky grayish brown, the 

 secondaries with paler margins, these sometimes whitish terminally; 

 lores blackish; auricular, suborbital, and malar regions, chin and 

 throat, rich chestnut, this sometimes extending, narrowly, around pos- 

 terior margin of the black pileum; a patch of somewhat glossy black 

 on lower throat, sometimes extending, brokenly, over upper median 

 portion of chest; chest, sides, and flanks pale grayish brown, the first 

 usually more or less tinged with pale chestnut, sometimes strongly so; 

 rest of under parts whitish, the longer upper tail-coverts dusky, or 

 dark grayish brown, margined with white; under wing-coverts and 

 axillars pale brownish gray; bill black; iris brown; legs and feet 

 dusky or horn colored. 



Young. — Much duller in color than adults; pileum, back, and scapu- 

 lars dull blackish or sooty, the feathers often with more or less distinct 

 paler terminal margins; tertials margined terminally with pale 

 vinaceous-cinnamon; forehead sometimes dull chestnut or brownish, 

 more often dusky, like crown; sides of head and throat mixed grayish 

 brown, dusky and dull chestnut, in varying relative amount;* rest of 

 under parts as in adults, but sides, flanks, and under tail-coverts more 

 or less strongly tinged with pinkish buff or vinaceous-buff. 



«I am unable to give characters which will serve to distinguish the young of 

 these two forms. 



6 The young of this species are remarkably affected by partial albinism about the 

 head, every one of the sixteen specimens in first plumage examined in the present 

 connection having a greater or less number of white feathers scattered among the 

 normally colored ones, chiefly on the throat or forehead, or both. 



