BIRDS OF NORTH AND MIDDLE AMERICA. 51 



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

 Brewster Couut^' (Paisano), and Valverde County (Langtrj'), and south- 

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

 (Mirador, Aug'ust); south in winter to Costa Rica and Panama. 



Petrochelidon lunifwiis (not Hirundo binifrons Say) I>a\vrence, 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 (Co-sta 

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

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

 Valley, resident). 



Petrochelidon sivamsoid (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). 



(?) Petrochelidon stcain>tonii SuMicnRAST, 'Slem. Bost. Soc. N. H., i, 1869, 547 (Ori- 

 zaba and plateau district. Vera Cruz). 



[Petrochelidoii] pyrrhonota (not Hirundo jiyrrhonotaWoiWotl) Scl.\ter and S.a.lvix, 

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



Petrochelidon pyrrhonota Salvin and God>i.\x, Biol. Centr.-Am., Aves, i, 1883, 

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



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

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



PETROCHELIDON LUNIFRONS MELANOGASTER (Swainson). 

 SWAINSONS CLIFF SWALLOW. 



Similar to P. I. favhind. 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 fronttd patch, 

 very sharply defined posteriori}' and with the extremities pointed; 

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

 !)e<'oniiiig 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 

 distint't (sometimes small and broken) of slightly glossy black, extend- 

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

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

 cially on chest; under tail-coverts brownish gray or hair l)rown, 

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

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

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

 or dusky. 



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



