BIRDS OF KOBTH AND MIDDLE AMEEIOA. 51 



Southwestern Texas, west of the Pecos River, in Presidio County, 

 Brewster County (Paisano), and Valverde County (Langtry), and south- 

 ward along eastern border of Mexican plateau to State of Vera Cruz 

 (Mirador, August) ; south in winter to Costa Rica and Panama. 



Petrochettdon lunifrons (not Hirundo lunifrons Say) Lawrence, Ann. Lye. N. Y., 

 vii, 1862, 317 (Panama R. R.).— Baird, Review Am. Birds, 1866, 288, part 

 (Panama). — Zeledon, Anal. Mus. Nac. Costa Rica, i, 1887, 107 (Costa 

 Rica).— RiDGWAY, Pron. U. S. Nat. Mus., xi, 1888, 540 (San Jos6 and Tala- 

 manca, Costa Rica). — ^Mearns, Auk, xix, 1902, 73, footnote (Rio Grande 

 Valley, resident). 



Petrochelidon swainsoni (not of Sclater) Baird, Review Am. Birds, 1866, 290, 

 part (Mirador, Vera Cruz) .— (?) Sharpe, Cat. Birds Brit. Mus., x, 1885, 194, 

 635, part (Costa Rica). 



(7) Petrochelidon swainsonii Sumichrast, Mem. Bost. Soc. N. H., i, 1869, 547 (Ori- 

 zaba and plateau district. Vera Cruz). 



[Petrochelidon] pyrrkonota (not Hirundo pyrrhonotaYieiWot ?) Sclater and Salvin, 

 Nom. Av. Neotr., 1873^ 14, part. 



Petrochelidon pyrrhonota Salvin and Godman, Biol. Centr.-Am., Aves, i, 1883, 

 226, part (Panama). — Sharpe and Wyatt, Mon. Hirund., 1894, 531, 590, part. 



Petrochelidon lunifrons tachina Oberholseh, Proc. Biol. Soc. Wash., xvi, Feb. 21, 

 1903, 15 (Langtry, Valverde Co., Texas; coll. U. S. Nat. Mus.). 



PETROCHELIDON LUNIFRONS MELANOGASTER (Swainson). 

 SWAINSON'S CLIFF SWAXIOW, 



Similar to P. I. tachina, but with the forehead chestnut or cinnamon- 

 rufous instead of pale cinnamon or fawn color. 



Adults (sexes alike). — Forehead deep cinnamon-rufous or chestnut 

 (similar in color to sides of head), forming a conspicuous frontal patch, 

 very sharply defined posteriorly and with the extremities pointed; 

 crown and occiput glossy blue-black; hindneck brownish gray, usually 

 becoming chestnut on nape, next to posterior margin of the black 

 pileum; back and scapulars glossy blue-black, the former streaked 

 with white or pale grayish; rump cinnamon-rufous or vinaceous- 

 cinnamon; upper tail-coverts brownish gray or hair brown margined 

 with paler; wings and tail dusky hair brown, faintly glossed; lores 

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

 rich chestnut, this usually extending around nape behind posterior 

 margin of the black pileum; lower throat with a patch, more or less 

 distinct (sometimes small and broken) of slightly glossy black, extend- 

 ing brokenly to median upper portion of chest; chest, sides, and flanks 

 pale grayish brown, usuallj' more or less tinged with cinnamon, espe- 

 cially on chest; under tail-coverts brownish gray or hair brown, 

 margined with white; axillars and under wing-coverts hair brown; rest 

 of under parts dull white, the anal region usually strongly tinged with 

 vinaceous-cinnamon; bill black; iris brown; legs and feet horn color 

 or dusky. 



Young. — Much duller in color than adults; chestnut of head duller, 



