BIRDS OF NORTH AND MIDDLE AMERICA, 629 
ARCHILOCHUS COLUBRIS (Linnzus). 
RUBY-THROATED HUMMING BIRD. 
Adult male——Above metallic bronze-green, including middle pair 
of rectrices; remiges dark brownish slate or dusky, faintly glossed 
with purplish; tail (except middle pair of rectrices) dark bronzy 
purplish or purplish bronzy black; chin, malar region, suborbital 
region, and auricular region velvety black; a small postocular spot 
of white; whole throat brilliant metallic red (nearest. geranium red 
in position a) changing to golden or even greenish in position b; 
chest dull brownish white or very pale buffy brownish gray, passing 
gradually into deeper brownish gray on breast and abdomen, the 
sides and flanks darker and overlaid by metallic bronze-green; 
femoral tufts and tuft on each side of rump white; under tail-coverts 
brownish gray (sometimes glossed with greenish bronze) centrally, 
broadly margined with dull white; bill dull black; iris dark brown; 
‘feet dusky; length (skins), 76-89 (83); wing, 37-40 (88.5); tail, 
25.5-28.5 (27); middle rectrices, 18-20.5 (19); exposed culmen, 15-17 
(15.9) .% 
Adult female—Above metallic bronze-green, golden green, or 
greenish bronze, including middle pair of rectrices; three outer rec- 
trices, on each side, broadly tipped with white (the white tip on 
third rectrix smaller and mostly confined to inner web), metallic 
bronze-green for basal half (more or less) the intervening portion 
black; remiges dark brownish slate or dusky, faintly glossed with 
purplish; a small postocular spot of dull white; auricular region deep 
dull grayish; lores dusky; malar region and under parts dull grayish 
white or very pale brownish gray (usually more decidedly whitish on 
chin, throat, and malar region), the flanks and shorter under tail- 
coverts usually more or less tinged with pale buffy brownish; femoral 
tufts and tuft on each side of rump white; bill, etc., as in adult 
male; length (skins), 78-89 (85); wing, 43.5-45.5 (44.5); tail, 25-26.5 
(25.6); middle rectrices, 22-24.5 (23); exposed culmen, 17-19.5 
(18.2).4 
Young male.—Similar to the adult female, but feathers of upper 
parts very narrowly and indistinctly margined terminally with pale 
grayish buffy, throat with small mesial streaks of dusky, and under 
parts usually more strongly tinged with buffy brownish, especially 
on sides and flanks. 
Young female.—Similar to the young male, but throat without 
dusky streaks. 
Eastern North America; north, regularly to southern Labrador 
(casually to Davis Inlet), Quebec, Ontario, and Keewatin (to about 
latitude 52°), and in the interior to northern Alberta (near Lake 
@ Ten specimens. 
