312 
(47.) 
NORTH AMERICAN BIRDS. 
with light buffy or pale rusty, the male with throat 
streaked with dusky. Hggs .50 x .33. Hab. Western 
United States, east to Rocky Mountains, south over table- 
lands of Mexico........... 429. T. alexandri Bourc. & Mus. 
Black-chinned Hummingbird. 
a’, Outer tail-feather decidedly shorter than middle pair, or else de- 
cidedly longer, abruptly narrower than the next.' 
é. Tail without any rufous; adult males with tail forked (but feath- 
ers not pointed), and top of head brilliant metallic reddish 
purple, or violet, like gorget. (Subgenus Calypte Goutp.) 
fi. Outer tail-feather in adult male abruptly much narrower 
than the others ; rump and middle tail-feathers metallic 
green or bronze, like back. 
g. Adult male: Head, including ruff, brilliantly burnished 
metallic amethyst-violet, changing to blue and 
green ; length about 2.75-3.20, wing 1.75-1.90, tail 
1.10, culmen .65-.68. Adult female: Lower parts 
grayish white, very faintly tinged with green on 
sides and flanks; centre of throat usually more or 
less spotted with metallic violet-purplish ; length 
about 3.55-3.70, wing 1.70, tail 1.05, culmen .70. 
Young: Similar to adult female, but metallic 
colors rather duller, and feathers of upper parts 
narrowly tipped or margined with buffy whitish. 
Vest about 1.50 wide by 1.00 deep externally, the 
cavity about 1.00 wide by .80 deep, composed of 
grayish lichens, small strips of thin bark, spiders’ 
webs, etc., lined with downy materials, including 
(usually) a few soft feathers. Eggs 48 x .31. 
Hab. Lower California, southern California and 
Arizona, and western Mexico, south to Mazatlan. 
430. T. costze (Bourc.). Costa's Hummingbird. 
g. Adult male: Head, including ruff, brilliant metallic 
changeable purplish red, with violet reflections; 
length about 3.40-3.60, wing 1.90-2.00, tail 1.30- 
1.45, culmen .65-.70. Adult female: Lower parts 
pale grayish, glossed on sides and flanks with 
green; centre of throat usually more or less 
spotted with metallic reddish purple; length about 
3.80-4.15, wing 2.05, tail 1.30, culmen .75. Eggs 
52 X 34. Hab. Valleys of California, and south 
through Arizona to table-lands of Mexico. 
431. T. anna (Less.). Anna’s Hummingbird. 
1 Except in Calypte helenz, which see. 
