52 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



that of the forehead sometimes replaced by dull brown;" pileum, back, 

 and scapulars blackish, faintly glossed, the scapulars and interscapulars 

 (at least the more posterior ones) indistinctly margined terminally 

 with paler, secondaries (especially tertials) margined terminally with 

 whitish or pale cinnamon, and the rump vinaceous-cinnamon. 



Adult male.—Length (skins), 111-142 (122); wing, 100-108 (103); 

 tail, 44r-50 (46.6); exposed culmen, 6-7 (6.8); width of bill at frontal 

 antiifi, 6; tarsus, 11-13 (12); middle toe, 11-12 (11).* 



Adult female.— Length (skins), 118; wing, 103; tail, 46-48 (4Y); 

 exposed culmen, 7; width of bill at frontal antise, 6; tarsus, 12; middle 

 toe, ll.<^ 



Western portion of Mexican plateau, in States of Oaxaca, Michoacan, 

 Guanajuato, Durango, Chihuahua, Sonora, etc., north to southern 

 Arizona (Nogales; San Bernardino Ranch); Guatemala?. 



Hlrundo melanogaster Swainson, Philos. Mag., new ser., i, 1827, 366 ("Table-land 

 of Mexico;" coll. Bullock Mus.); Isis., 1834, 783. 



Hlirundo] melanogaster Swainson and Richardson, Fauna Bor.-Am. ii, 1831, 331, 

 footnote (crit.). — Gray, Gen. Birds, i, 1845, 58. 



IHirundo} melanoffostra Gray, Hand-list, i, 1869, 71, no. 835. 



Pletrochelidon] melanogastra Oabanis, Mus. Hein., i, 1850, 47 (Mexico). 



Petrochelidon melanogastra American Ornithologists' "Union Committee, Auk, 

 xix, 1902, 324 (Check List no. 612.2). 



Pletrochelidon] melanogaster Eidgway, Man. N. Am. Birds, 1887, 460. — Meakns, 

 Auk, xix, 1902, 73, footnote (Mexican boundary line, from San Luis Mts. to 

 ilSTogales). 



(?) Petrochelidon melanogaster Zeledon, Anal. Mus. Nac. Costa Bica, 1887, 107 

 (Costa Rica). 



[Hirundo'] fulva (not of Vieillot) BoiE, Isis, 1844, 175, part. 



Petrochelidon swainsoni ScjjAtsb., Proc. Zool. Soc. Lond., 1858, 296 (Oaxaca, Mex- 

 ico; coll. P. L. Sclater); 1859, 376 (Oaxaca). — Baird, Review Am. Birds, 

 1865, 290 (Mirador, Vera Cruz). — Salvin, Ibis, 1866, 192 (Duenas, Guate- 

 mala) . — Lawrence, Bull. U. S. Nat. Mus., no., 4, 1876, 17 (Tehuantepec City, 

 Oct.). — ^DuQES, La Naturaleza, i, 1869, 141 (Guanajuato). — Salvin and God- 

 man, Biol. Centr.-Am., Aves, i, 1883, 227. — Sharpe, Cat. Birds Brit. Mus., x, 

 1885, 194, 635 (Oaxaca, Mexico; Duenas, Guatemala). — Sharpe and Wyatt, 

 Mon. Hirund., 1894, 555, 592, pi. 105. 



Petrochelidon swainsonii Sclater, Cat. Am. Birds, 1862, 40 (Mexico). 



{Petrochelidon'] swaijisom Sclater and Salvin, Nom. Av. Neotr., 1873, 14. — Baird, 

 Brewer, and Ridgway, Hist. N. Am. B^irds, i, 1874, 335. 



JKnmdo coronate LiCHTENSTEiN, Preis-Verz. Mex. Vog., 1831, 2 (nomen nudum; 

 see Cabanis, Journ. fiir Orn., 1863, 58). 



Petrochelidon lunifrons (not Hirundo lunifrons Say) Coues, Birds Col. Val., 1878, 

 426, part (in synonymy). 



a The young of this subspecies is apparently not affected by partial albinism in the 

 plumage of the head as that of P. I. lunifrons and P. I. tachina. 

 ^ Eight specimens. 

 «Two specimens. 



