NORTHERN VIOLET-GREEN SWALLOW, 
615. Tachycineta thalassina lepida. 5% Niches 
In the Rocky Mountain regions of the United States and 
west to the Pacific, breeding throughout its range. A most 
beautiful species with its blue, green and purple back and 
white under parts. They are abundant in favorable locali 
ties in California, building their nests m holes of trees, at 
times well up in the mountains, in the tops of some of the 
largest redwoods and pines, using woodpecker holes, and a 
times placing their nest in a crevice of the cliffs. Their 
nests are made of grass and fine roots, and nicely lined wit 
feathers. Their four to six eggs are pure white (.72x.50). 
BANK SWALLOW. 
616. Biparia riparia. 5% inches.. 
The whole of North America north to the limit of trees, and 
south to the Gulf of Mexico, breeding from the middle portion 
of the United States northward. These birds build then nests 
in sand banks in almost all sections of the country, digging a 
small tunnel from one to three feet m length, enlarged and 
lined with grass at the end. They lay from four to six pure 
white eggs (.70 x .50). 
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