(Chordeiles virginianus. 420.)

On the wing overhead after insects just before or at dusk; long, pointed wings showing a white patch; flight resembles that of [Chimney Swift]; sharp note, “skeep;” often nests on the flat roofs of city buildings. [Whip-poor-will.]

109. BLACK-BILLED CUCKOO. 12 in.

(Coccyzus erythropthalmus. 388.)

Bronzy olive-gray; white below; bill entirely black; only a little white on tail; movements like those of Yellow-billed Cuckoo; song, soft “coo-coo, coo-coo.” [Yellow-billed Cuckoo.] [Mourning Dove.]

110. GRAY-CHEEKED THRUSH. 7-1/2 in.

(Hylocichla aliciae. 757.)

Uniform olive; below white, very palely suffused with buff; cheeks gray tinged; breast and sides of throat, spotted; usually silent in Lincoln Park. [Olive-backed] and [other Thrushes.]

111. YELLOW-HEADED BLACKBIRD. 10-1/4 in.

(Xanthocephalus xanthocephalus. 497.)