312 NORTH AMERICAN BIRDS. 



streaked with dusky. Eggs .49 X -31. Hab. Western 

 United States, east 'to Eocky Mountains, south over table- 

 lands of Mexico 429. T. alexandri BOURC. & MULS. 



Black-chinned Hummingbird. 



cZ*. Outer tail-feather decidedly shorter than middle pair, or else de- 

 cidedly longer, abruptly narrower than the next, 1 and top of 

 head colored like the gorget. 



e l . 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 GOULD.) 

 /*. Outer tail-feather in adult male abruptly much narrower 

 than the others ; rump and middle tail-feathers metallic 

 green or bronze, like back. 



g l . 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-.6S. 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. 

 Nest 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 .45 X -30. 

 Hab. Lower California, southern California and 

 Arizona, and western Mexico, south to Mazatlan. 

 430. T. costse (Bounc.). 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 

 .48 X -32. Hab. Valleys of California, and south 

 through Arizona to table-lands of Mexico. 



431. T. anna (LESS.). Anna's Hummingbird. 



1 Except in Calypte helente, which see. 



