Clivicola riparia. Revival of the Sexual Passion in Birds in Autumn. William Brewster, Cambridge, Mass. Auk, XV, April, 1898, pp.194-5. See under Petrochelidon lunifrons. Colio riparia. 1874. Maine (Lake Umbagog). Aug. Saw several to-day. Aug. 8. Still here. 1876. June 12. Nest with five fresh eggs. copy 2 1879. June 8. The other day I saw a troupe of a dozen or more play- ing with a feather. A strong wind was blowing at the time and as they passed it from one to another, each dropping it for his neighbor to pick it up, the party drifted away across the fields reminding me of a crowd of excited school boys playing at foot ball.