748 BULLETIN 50, TJNITED STATES NATIONAL MUSEUM. 



IBaaileuteru^'] rufifrons Sclatbr and Salvin, Nom. Av. Neotr., 1873, 10, part. 

 Blaiileuterus] rufifrons Ridgway, Man. N. Am. Birds, 1887, 532, part. 

 Basileuterus rufifrons dugesi Ridgway, Proo. U. H. Nat. Mus., xv, no. 895, July 18, 



1892, 119 (Guanajuato, Mexico; coll. U. S. Nat. Mus.). 



Basileuterus rufifrons jouyi (not of Ridgway) Jouv, Proc. U. S. Nat. Mus., xvi, 



1893, 777, part (Barranca Ibarra, Jalisco). 



BASILEUTERUS RUFIFRONS CAUDATUS Nelson. 

 LONG-TAILED 'WARBLEK, 



Similar to J5. r. dugesi, but with much less of rufous on pileum, the 

 median portion of occiput and crown being brownish gray, this some- 

 times extending to the forehead; back, etc., slightly grayer; bill 

 smaller, and tail longer. 



Adult mall'. — Length (skins), 123; wing, 50-51 (50.6); tail, 59-60 

 (59.5); exposed culmen, 8.5-9 (8.7); tarsus, 20-22 (21).' 



Adidt female.— Liength (skins), 124; wing, 50; tail, 58.5-61.5 (60); 

 exposed culmen, 9-9.2 (9.1); tarsus, 20.5.' 



Northwestern Mexico, in States of Sonora (Alamos, etc.,) and 

 Chihuahua (Batopilas; Napolera). 



Basileuterus rufifrons (not Setophaga rufifrons Swainson) Allen, Bull. Am. Mus. 



N. H., V, 1893, 41 (Napolera, n. w. Chihuahua, Dec. 8). 

 Basileuterus rufifrons caudatus Nelson, Proc. Biol. Soc. Wash., xiii, May 29, 1899, 



29 (Alamos, Sonora; coll. U. S. Nat. Mus.). 



BASILEUTERUS RUFIFRONS FLAVIGASTER (Nelson). 

 CHI&F&S WARBLER. 



Similar to B. r. rufifrons, but with the under parts more extensively 

 yellow, sometimes entirely yellow, except the anal region or lower 

 abdomen, which are yellowish white or pale buffy yellow, and sides 

 and flanks, which are greenish olive. 



Adult mfflfo.— Length (skins), 113-120 (116.4); wing, 50-53 (51.6); 

 tail, 60-56 (53. 8); exposed culmen, 10-11.6(10.9); tarsus, 20-22(20.9).' 



Adult female. — Length (skin), 118; wing, 50.6; tail, 54; exposed 

 culmen, 10; tarsus, 22.' 



Southeastern Mexico, from southern Vera Cruz (San Andreas Tuxtla) 

 through Tabasco (Teapa) to Chiapas (Yajalon); Guatemala.* 



Basileuterus delaUrii (not of Bonaparte) Sclater, Cat. Am. Birds, 1862, 35 

 (Mexico). — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1881, 176, 

 part.— Sharpe, Cat. Birds Brit. Mus., x, 1885, 396, part. 



(?) Bastileuterus rufifrons (not Setophaga rufifrons B'wa.mson) Salvin, Ibis, 1866, 192 

 (Duenas, Guatemala). 



Basileuterus flaiigaster Nelson, Auk, xiv, Jan., 1897, 67 (Yajalon, Chiapas, s. e. 

 Mexico; coll. U. S. Nat. Mus.). 



' Two specimens. ' Six specimens. ' One specimen. 



*I am unable to cite Guatemalan localities, tlie specimens examined being labeled 

 simply "Guatemala." 



