Carriker : List of the Birds of Costa Rica. 699 



455. Empidonax trailli alnorum Brewster. 



Empidonax trailli Lawrence, Ann. Lye. N. Y., IX, 1868, 114 (Dota [F. Car- 

 mioll). — Frantzius, Jour, fiir Orn., 1869, 308 (Costa Rica) (?). 



Empidonax traillii alnorum Brewster, Auk, XT I, 1895, 161 (Upton, Maine, 

 U. S. A.). — Ridgway, Birds N. and Mid. Amer., IV, 1907, 558 (northeastern 

 U. S., south in winter through Central America to Ecuador. — Costa Rica: 

 Dota, Talamanca, Juan Viiias, and Pozo Aziil de Piriis). 



Bangs Collection: Boruca, April 27 to May 15, 1906; Buenos Aires, May 



22, 1908; Pozo Azul de Pirris, May 31, 1902; Juan Vinas, May 4; 



Bolson, Dec. 13, 1907 (Underwood). 

 Fleming Collection: Carrillo, Oct. 15, 1898, and May 4, 1899 (Underwood). 

 Carnegie Museum: Rio Sicsola, 9, Sept. 4, 1904; Juan Vinas, May 10, 



1907 (Carriker). Two skins. 



Taken with the following form in about the same localities and on the 

 same dates. Fairly common at times, but not long, as some seem to re- 

 main and others drift off farther south. 



456. Empidonax trailli trailli (Audubon). 



Muscicapa traillii Audubon, Orn. Biogr., I, 1832, 236 (Arkansas, U. S. A., types 

 in U. S. Nat. Mus.). 



Empidonax trailli Lawrence, Ann. Lye. N. Y., IX, 1868, 114 (Dota [F. Car- 

 miol]). — Sclater, Cat. Birds Brit. Mus., XIV, 1888, 226 (no C. R. speci- 

 mens). — Salvin and Godman, Biol. Centr.-Am., Aves, II, 1889. 71 (Costa 

 Rican refeience). 



Empidonax traillii traillii Ridgway, Birds N. and Mid. Amer., IV, 1907, 555 

 (western North America, south in winter to Colombia. — Costa Rica: Pozo 

 Azul de Pirris). — Bangs, Auk, X XIV, 1907, 302 (Boruca, two $ 's, April 28, 

 and El Pozo d~ Terraba, $ , Aug. 15, 1906, Underwood). 



Acad. Nat. Sci. Philadelphia: Miravalles, Sept. 16, 1895 (Underwood). 

 Bangs Collection: Pozo Azul de Pirris, May 2; Bolson, Dec. 10 to 24, 



1907 (Underwood). 

 Carnegie Museum: Rio Sicsola, 9, Sept. 24, 1904; Juan Vinas, d\ May 



10, 1907 (Carriker). 



A winter visitor over the whole of the country, but perhaps not found 

 above 4,000 feet. 



457. Empidonax virescens (Vieillot). 



Platyrhynchus virescens Vieillot, Nouv. Diet. d'F^t. Nat., XXVII, 1818, 22 

 (based on Muscicapa querula Wilson, Amer. Orn., II, 1810, 77, pi. 13, fig. 2, 

 not M. querula Vieillot, 1807). 



Empidonax acadicus Sclater, Cat. Birds Brit. Mus., XIV, 1888, 228 (Costa 

 Rica [Endres]). — Salvin and Godman, Biol. Centr.-Am., Aves, II, 1889, 



