Tail slightly emarginate, margin of first quill rough with the strong
decurved tips of the filaments, tarsus bare; upper parts
greyish-brown, lower pale greyish-brown, white behind. Very nearly
allied to the last in form and colour, but readily distinguishable by
drawing the finger along the edge of the wing, when the stiff
projecting tips of the filaments are felt like the edge of a fine saw.
_Male_, 5-3/4, 12-1/2.
Louisiana and South Carolina. Migratory.
Rough-winged Swallow, Hirundo serripennis, Aud. Orn. Biog. v.
iv. p. 593.