748 BITLLETIN 50, UNITED STATES NATIONAL MITSEUM. 



IBasileuterusI ?'«//fro7(,s' Sclater and Salvin, Noin. Av. Neotr. , 187.'!, 10, part. 

 Blaslleuterusi rnjifrona RiixiWAY, Man. N. Am. Bird.s, 1887, .582, ))art. 

 Basileiderus mfifrorts dugesi Ridgwav, Proc. U. S. Nat. Mus., xv, no. 89.5, July 18, 



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

 BasilerUerus rnfifrons juui/i (not of Ridgway) Jouy, Proc. U.S. Nat. Mns., xvi, 



189,3, 777, part (Barranca Ibarra, Jali.'.^co). 



BASILEUTERUS RUFIFRONS CAUDATUS Nelson. 

 LONG-TAILED WARBLER. 



Similar to B. r. <lages/\ but witli much le.ss of rufous on pileuni, the 

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

 times extending- to the forehead; ]>uck, etc., slightl}^ grayer; bill 

 smaller, and tail longer. 



Adult male.— Length (skins), 123; wing, 50-51 (50.5); tail, 59-60 

 (59.5); exposed culmen, 8.5-9 (8. 7); tarsus, 20-22 (21).^ 



Adtflt female.— Length (skins), 124; wing, 50; tail, 58.5-(31.5 (00); 

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



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

 Chihuahua (Batopilas; Napolera). 



BasUeuterus rufifrons (not SeiopJiaga rnfifrons Swainson) Allen, Bull. Am. Mus. 



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

 Bnsilriiteni ft rufifrons avmlatus Nelson, Proc. Biol. Soc. Wash., xiii, May 29, 1899, 



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



BASILEUTERUS RUFIFRONS FLAVIGASTER (Nelson). 

 CHIAPAS WARBLER. 



Similar to B. r. ruffrons.^ l)ut with the under parts more extensively 

 yellow, sometimes entirely 3'ellow, except the anal region or lower 

 a])domen, which are yellowish white or pale buffy yellow, and sides 

 and flanks, which are greenish olive. 



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

 tail, 50-56 (53.8); exposed culmen, 10-11.5(10.9); tarsus, 20-22(20.9).' 



Adult female. — Length (skin), 118; wing, 50.5; tail, 54; expo.sed 

 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, ?>b 

 (Mexico). — Salvin and GoDiMan, Biol. Centr.-Am., Aves, i, 1881, 17(5, 

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



(?) BasUeuterns 'rufifrons (not Setoj^haga rnfifrons Swainaon) Salvin, Ibis, 1866, 192 

 (Duenas, Guatemala). 



Basilnderns flarigaster Nelson, Auk, xiv, Jan., 1897, 67 (Yajalon, ('hiajias, s. e. 

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



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



*I am unable to cite Guatemalan localities, the specimens examined l)eing labeled 

 simply "Guatemala." 



