429 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Guerrero; Tonal4, Chiapas).—Satvin and Gopmay, Biol. Centr.-Am., Aves, 
ii, 1892, 289 (Putla and Tehudntepec, Oaxaca; Tonal4, Chiapas).—Boucarp, 
Gen. Hum. B. 1894, 164 (Putla).—Harrert (E. and C.), Novit. Zool., i, 1894, 
62 (Zumpango del Rio and Chilpancingo, Guerrero). 
Cyanomya viridifrons Boucarp, Ann. Soc. Linn. Lyon, xx, 1874, 277 
(‘Puebla ’’=Putla ?). 
Uranomitra viridifrons Exsiot, Classif. and Synop. Troch., 1879, 197 .—SHARPE, 
in Gould’s Mon. Troch., Suppl., 1885, pl. 49.—Brruepscu, Proc. U. 8. 
Nat. Mus., xi, 1888, 562 (Sta. Efigénia, Oaxaca). 
[Cyanomyia] viridifrons ScLateR and Satvin, Nom. Av. Neotr., 1873, 91. 
Cyanomia viridifrons D’Oca, Los Colibr. Mex., 1875, 58. 
Leucolia viridifrons Mutsant and Verreaux, Hist. Nat. Ois.-Mouch., i, live. 3, 
1874, 224 (Putla). 
Leucolia viridi-frons Mutsant and Verreavx, Hist. Nat. Ois.-Mouch., Suppl. 
plates (no date), pl. 27. 
[Leucolia] viridifrons Muusant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 204. 
A[mazilia] viridifrons Hartert, Das Tierreich, Troch., 1900, 62 (monogr.). 
[Amazilia] viridifrons Saarpe, Hand-list, ii, 1900, 109. 
[ Uranomitra] violiceps viridifrons Smmon, Cat. Troch., 1897, 14. 
Cyanomyia guerrerensis Satvin and Gopman, Biol. Centr.-Am., ii, sig. 37, July, 
4892, 290 (Rincén, Acahuitzotla, and Tierra Colorado, Sierra Madre del 
Sur, Guerrero, Mexico; coll. Salvin and Godman).—Bovucarp, Gen. Hum. 
Birds, 1894, 165 (Putla, Oaxaca). 
[ Uranomitra] guerrerensis Stuon, Cat. Troch., 1897, 14. 
A[mazilia] guerrerensis Hartert, Das Tierreich, Troch., 1900, 63 (monogr.). 
[Amazilia] guerrerensis SHarPE, Hand-list, 1i, 1900, 109. 
AMIZILIS VERTICALIS (Lichtenstein). 
BLACK-BILLED AZURE-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).2 
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).° 
@ Nine specimens. 6 Six specimens. 
