422 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Guerrero; Tonala, Chiapas). — Salvin and Godman, Biol. Centr.-Am., Aves, 



ii, 1892, 289 (Piitla and Tehudntepec, Oaxaca; Tonald, Chiapas). — Boucard, 



Gen. Hum. B. 1894, 164 (Putla).— Hartert (E. and C), Novit. Zool., i, 1894, 



62 (Zumpango del Rio and Chilpancingo, Guerrero). 

 Cyanomya viridifrons Boucard, Ann. Soc. Linn. Lyon, xx, 1874, 277 



("Puebla"= Putla?). 

 Uranomitra viridifrons Elliot, Classif. and Synop. Troch., 1879, 197. — Sharpe, 



in Gould's Mon. Troch., Suppl., 1885, pi. 49. — Berlepsch, Proc. U. S. 



Nat. Mus., xi, 1888, 562 (Sta. Efigenia, Oaxaca). 

 [Cyanomyia] viridifrons Sclater and Salvin, Nom. Av. Neotr., 1873, 91. 

 Cyanomia viridifrons D'Oca, Los Colibr. Mex., 1875, 58. 

 Leucolia viridifrons Mulsant and Verreaux, Hist. Nat. Ois.-Mouch., i, livr. 3, 



1874, 224 (Putla). 

 Leucolia viridifrons Mulsant and Verreaux, Hist. Nat. Ois.-Mouch., Suppl. 



plates (no date), pi. 27. 

 [Leucolia] viridifrons Mulsant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 204. 

 A['mazilia] viridifrons Hartert, Das Tierreich, Troch., 1900, 62 (monogr.). 

 [Arrtazilia] viridifrons Sharps, Hand-list, ii, 1900, 109. 

 [Uranomitra] violiceps viridifrons Simon, Cat. Troch., 1897, 14. 

 Cyanomyia guerrerensis Salvin and Godman, Biol. Centr.-Am., ii, sig. 37, July, 



1892, 290 (Rinc6n, Acahuitzotla, and Tierra Colorado, Sierra Madre del 



Sur, Guerrero, Mexico; coll. Salvin and Godman). — Boucard, Gen. Hum. 



Birds, 1894, 165 (Putla, Oaxaca). 

 [Uranomitra] guerrerensis Simon, Cat. Troch., 1897, 14. 



A[nuizilia] guerrerensis Hartert, Das Tierreich, Troch., 1900, 63 (monogr.). 

 [Amazilia] guerrerensis Sharpe, Hand-list, ii, 1900, 109. 



AMIZILIS VERTICALIS (Lichtenstein). 



BLACK-BILLED AZXTRE-CROWN. 



Adult male. — Pileum bright metallic blue or violet-blue; hindneck, 

 upper back, scapulars, and wing-coverts, dull bronze-green or olive 

 glossed with bronze-green, the first usually more or less tinged or 

 intermixed with blue on upper portion and along junction with 

 white of foreneck; lower back, rump, and upper tail-coverts grayish 

 brown or olive faintly glossed with bronze-greenish, the feathers 

 sometimes narrowly and indistinctly paler on terminal margin, espe- 

 cially the upper tail-coverts, which are usually slightly more bronze- 

 greenish; tail rather dull metallic greenish bronze; remiges dusky, 

 faintly glossed with violet; rictal and malar regions and under parts 

 (including under tail-coverts) immaculate white, the sides mostly 

 light olive glossed with bronze-greenish; bill light brownish (rosy or 

 carmine red in life?), dusky at tip; iris dark brown; feet dusky (in 

 dried skins); length (skins), 98-105 (102); wing, 53-59.5 (57); tail, 

 29-32 (30.9); culmen, 21-23.5 (22.6).« 



Adult female. — Similar to the adult male and not always dis- 

 tinguishable but usually with coloration slightly duller; length 

 (skins), 98-104 (100); wing, 52-57 (54.9); tail, 27-31.5 (29.6); cul- 

 men, 21.5-24.5(23.1).^ 



a Nine Bpecimens. & Six Bpecimens. 



