312 NORTH AMERICAN BIRDS. 



streaked Avith dusky. Eggs .49 X -31. Hah. Western 

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

 lands of Mexico 429. T. alexandri Bourc. & Muls. 



Black-chinned Hummingbird. 

 d}. Outer tail-feather decidedly shorter than middle pair, or else de- 

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

 head colored like the gorget. 

 e\ Tail without any rufous; adult males with tail forked (but feath- 

 ers not j3ointed), and top of head brillia'nt 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^. 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, ver}'- 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. 

 I^est about 1.50 wide bj^ 1.00 deep externally, the 

 cavity about 1.00 wide by .80 deep, composed of 

 grayish lichens, small strips of thin bark, sjDiders' 

 webs, etc., lined with down}^ materials, including 

 (usually) a few soft feathers. Eggs .45 X -30. 

 Sab. Lower California, southern California and 

 Arizona, and western Mexico, south to Mazatlan. 

 430. T. costse (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 

 .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 helenm, which see. 



