BANK SWALLOW. 
616. Riparia riparia. 5% inches. 
These are the smallest of our Swallows; this species 
can be distinguished, even at a distance, by the con- 
spicuous band across the breast, showing in bold relief 
against the lighter throat. They are found throughout 
North America, breeding from the middle of the U. 8. 
north to the Arctic regions. 
They nest in colonies in holes in banks, laying the 
four to seven white egos on a grass nest in an ‘enlarged 
chamber at the end of the tunnel. 
ROUGH-WINGED SWALLOW. 
617. Stelgidopterysx serripennis. 5% inches. 
In this species the throat 1s gray as mel as the breast. 
The outer vane of the outer primary is stiff and bristly, 
thus giving the species its name. These birds breed 
from the Gulf north to Massachusetts and Washington, 
in banks or in crevices of stone bridges. The eggs can- 
not with certainty be distinguished “from those of the 
Eank Swallow. They measure .75 x .52. 
