100 BIRDS. 



the nest; species of Cvllocalia thus form the edible 

 bird's nest. Small birds of the warmer parts of the 

 world, bearing a superficial resemblance to Swallows, but 

 structurally very different, being closely related to the 

 Humming Birds. Genera six or eight; species about 

 fifty. 



* Tarsus bare, longer than middle toe; tail feathers with the 



shafts spinous, projecting beyond the plumage. 



CH,ETURA, 1. 



/. CHSETURA, Stephens. CHIMNEY SWALLOWS. 



1. C. pe/asff/ca,(L.) Baird. CHIMNEY SWIFT. Sooty 

 brown; throat paler; L. 5J; W. 5; T. 2. E. U. S., 

 abundant. 



FAMILY XXXIX. TROCHILID^E. . 



(The Humming Birds.) 



Bill subulate, usually longer than the head, straight or 

 curved; tongue capable of great protrusion. Wings 

 long and pointed, the secondaries short, only six in 

 number; tail of ten feathers. Feet very small, with 

 sharp claws. Smallest of all birds and among the most 

 brilliantly colored. Genera seventy -five; species three 

 hundred or more, thus forming one of the largest families 

 in Ornithology. All are American, and most of them 

 tropical, but our common species ranges far into British 

 America. 



* First primary not attenuate, bowed or curved inwards. 



TROCIHLUS, 1. 



/. TROCHILUS, Linnaeus. RUBY - THROATED HUMMING 



BIRDS. 



1. T. colubris, L. RUBY - THROATED HUMMING BIRD. 

 $ metallic green above; a ruby -red gorget; tail deeply 

 forked, uniform purplish; $ without red, the tail vari- 



