WHITE-THROATED SWIFT. 
425. Aeronautes mela?ioleucus. 6^4 inches. 
A handsome bird, in fact, the most beautiful and graceful of 
this family. Its flight is very rapid, and they congregate in 
thousands about the tops of inaccessible cliffs, where, in small 
burrows in the earth or under the sods, or in crevices they 
build their nests, which are generally made of roots and 
grasses and lined with feathers. Four or five dull white eggs 
are laid (.85 x .50). 
Range. —Western United States, mostly in the Rocky Moun¬ 
tains, and in California ranges north to Canada borders. 
RIVOLI HUMMINGBIRD.—Family Trochilidse. 
426. Eugenes fulgens. 5 inches. 
This is one of the most gorgeous of the Hummers, having the 
crown a violet purple color, and the throat a changeable bril¬ 
liant green. Upper parts a bronze green, the under parts almost 
a black. Female lacks all the brilliant colors of the male. 
Upper parts dull green, under parts greenish gray, top of head 
brownish with a small white spot back of the eye. This species 
saddles its nest upon the branches, generally for its favorite 
tree selecting a maple or sycamore, and usually at from twenty 
to thirty feet from the ground. 
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