BIRDS OF NORTH AND MIDDLE AMERICA, 421 
AMIZILIS VIRIDIFRONS (Elliot). 
GREEN-FRONTED HUMMING BIRD. 
Adult male.t—¥orehead and median portion of crown dark, slightly 
metallic, indigo blue; sides of crown, auricular region, occiput, and 
hindneck dusky metallic bronze-green, the upper back, scapulars, 
and wing-coverts rather brighter and more bronzy; lower back and 
rump grayish brown or olive, glossed with bronze; upper tail-coverts 
dull coppery bronze, narrowly margined with dull buffy whitish; tail 
metallic bronze, tinged with coppery bronze, the rectrices narrowly 
and indistinctly tipped with buffy; remiges dusky, faintly glossed 
with violet; suborbital region (anteriorly), rictal and malar regions, 
and under parts (including under tail-coverts), immaculate white, 
the sides partly grayish brown glossed with bronze; bill brownish 
(rosy red in life?), dusky terminally; iris dark brown; legs and feet 
dusky (in dried skins); length (skins), 99-103 (101); wing, 58-61.5 
(60.1); tail, 31.5-35 (33.2); culmen, 22-24.5 (23.2). 
Adult female.—Similar to the adult male (as described above), but 
forehead and crown dull dusky green, and rectrices without buffy 
tip; length (skins), 96-106 (100); wing, 55-60.5 (58.5); tail, 30.5-35 
(32.5); culmen, 20-24.5 (22.7).¢ 
Immature (2) male.A—Exactly like the adult female in coloration. 
Young.—Essentially like the adult female, but forehead and crown 
sooty, without trace of greenish or bluish gloss, and feathers of lower 
back, rump, and upper tail-coverts narrowly tipped or terminally 
margined with pale buffy grayish. 
Southwestern Mexico, in States of Guerrero (Rincén; Tierra Colo- 
rado; Zumpango del Rio; Chilpancingo; Coquilla; Acahuitzotla; 
Sierra Madre del Sur), Oaxaca (Putla; Tehuantepec; Santa Efigénia; 
Tapana), and Chiapas (Tonala). 
Cyanomyia viridifrons Extiot, Ann. and Mag. N. H., ser. 4, viii, 1871, 266 (Putla, 
Oaxaca; coll. D. G. Elliot); Ibis, 1876, 314 (Putla; synon.; crit.)—Dz Oca, 
La Naturaleza, iii, 1875, 304.—Satvin, Cat. Birds Brit. Mus., xvi, 1892, 196 
(Putla and Tehudntepec, Oaxaca; Rincén, Acahuitzotla, and Tierra Colorado, 
@ The only specimen examined corresponding in plumage to the fully adult male 
as described above is from Acahuitzotla, Guerrero, and represents the so-called 
Cyanomyia guerrerensis Salvin and Godman. All others examined lack both the 
dark blue forehead and buffy tip to the rectrices. I am fully convinced, however, 
that these bluish fronted specimens are neither specifically nor subspecifically dis- 
tinct from the greenish fronted ones, for the reason that the two occur in the same 
locality, both being represented from Acahuitzotla. Whether the apparently adult 
males with greenish forehead are in reality females wrongly sexed, are younger males, 
or merely represent individual variation can be determined only from more ample 
material. 
b Three specimens. 
¢ Six specimens. 
4 Possibly representing merely individual variation in the fully adult male. 
