BANK SWALLOW
616. Riparia riparia. 5¼ inches
These are the smallest of our Swallows; this species can be distinguished, even at a distance, by the conspicuous 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. S. north to the Arctic regions.
They nest in colonies in holes in banks, laying the four to seven white eggs on a grass nest in an enlarged chamber at the end of the tunnel.
ROUGH-WINGED SWALLOW
617. Stelgidopteryx serripennis. 5½ inches
In this species the throat is gray as well 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 cannot with certainty be distinguished from those of the [Bank Swallow]. They measure .75 × .52.
