Literature Cited
American Ornithologists' Union
1931. Check-list of North American birds. Fourth edition. Lancaster, Pa., xix + 526 pp.
Beecher, W. J.
1951a. Adaptations for food-getting in the American blackbirds. Auk, 68:411-440, 11 figs.
1951b. Convergence in the Coerebidae. Wilson Bull., 63:274-287, 5 figs.
1953. A phylogeny of the oscines. Auk, 70:270-333, 18 figs.
Berger, A. J.
1952. The comparative functional morphology of the pelvic appendage in three genera of Cuculidae. Amer. Mid. Nat., 47:513-605, 29 pls.