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 yinaceous-cinnamon. 



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

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

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



Adult female.— Length (skins), 118; wing, 103; tail, 46-48 (47); 

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

 toe, 11.^ 



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

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

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



Hirundo melanogader Swainson, Philos. Mag., new ser., i, 1827, 366 ("Table-land 

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



H{irunclo] mehmogaster Swainson and Richardson, Fauna Bor.-Am. ii, 1831, 331, 

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



IHirundo'] vielanogastra Gray, Hand-list, i, 1869, 71, no. 835. 



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



Peirochelidon melanogastra American Ornithologists' Union Committee, Auk, 

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



Pletrochelidon'] melanogaster Ridgway, Man. N. Am. Birds, 1887, 460. — Meaens, 

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

 Nogales). 



(?) Petroclielidon melanogaster Zeledon, Anal. Mus. Nac. Costa Eica, 1887, 107 

 . (Costa Rica). 



[^Flirundo'] fulva (not of Vieillot) Boie, Isis, 1844, 175, part. 



Petrochelidon sivainsoni Sclater, 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 (Duefiaa, Guate- 

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

 Oct.). — DuGEs, 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; Duefias, Guatemala). — Sharpe and Wyatt, 

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



Petrochelidon s7vainsonii SciiATEU, Cat. Am. Birds, 1862, 40 (Mexico). 



^Petrochelidon'] swamsonr Sclater and Salvin, Nom. Av. Neotr., 1873, 14. — Baird, 

 Brewer, and Ridgway, Hist. N. Am. Birds, i, 1874, 335. 



Hirundo coronata Lichtenstein, Preis-Verz. Mex. Yog., 1831, 2 (nomen nudum; 

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



Petroclielidon lunifrons (not H'lrundo 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. 



