ture of the
White-winged Dove (right side); superficial layer. x 5.

FIG. 16. Dorsal view of the jaw musculature of the Mourning Dove
(right side); superficial layer. x 5.]

[Illustration: FIG. 17. Dorsal view of the jaw musculature of the
White-winged Dove (right side); middle layer. x 5.

FIG. 18. Dorsal view of the jaw musculature of the Mourning Dove
(right side); middle layer. x 5.]

[Illustration: FIG. 19. Dorsal view of the jaw musculature of the
White-winged Dove (right side); deep layer. x 5.

FIG. 20. Dorsal view of the jaw musculature of the Morning Dove (right
side); deep layer. x 5.]

[Illustration: FIG. 21. Ventral view of the jaw musculature of the
White-winged Dove (_M. depressor mandibulae_ not shown). x 5.

FIG. 22. Ventral view of the jaw musculature of the Mourning Dove
(_M. depressor mandibulae_ not shown). x 5.]

LITERATURE CITED

ADAMS, L. A.
1919. A memoir on the phylogeny of the jaw muscles in recent and
fossil vertebrates. Annals New York Acad. Sci., 28:51-166.

AUDUBON, J. J.
1834. Ornithological biography. Vol. II. Adam & Charles Black,
Edinburgh, xxxii + 588 pp.

BAIRD, S. F., BREWER, T. M., and RIDGWAY, R.
1905. The land birds of North America. Little, Brown, and Company,
Boston, 560 + xxvii pp.

BEECHER, W. J.
1950. Convergent evolution in the American orioles. Wilson Bull.
62:51-86.

1951a. Adaptations for food-getting in the American blackbirds. Auk,
68:411-440.

1951b. Convergence in the Coerebidae. Wilson Bull., 63:274-287.

1953. A phylogeny of the oscines. Auk, 70:270-333.

BENT, A. C.
1932. Life histories of North American gallinaceous birds. Bull.
U. S. Nat. Mus., 162:xi + 490 pp., 93 pls.

BONAPARTE, C. L.
1838. Geographical and comparative list of the birds of Europe and
North America. John Van Voorst, London, vii + 68 pp.

BOND, J.
1961. Birds of the West Indies. Houghton Mifflin Company, Boston.
256 pp., 8 pls., 186 figs.

BOWMAN, R. I.
1961. Morphological differentiation and adaptation in the Galapagos
finches. Univ. California Publ. Zool., 58:vii + 302 pp.,
22 pls., 74 figs., 63 tables.

BURT, W. H.
1930. Adaptive modifications in the woodpeckers. Univ. California
Publ. Zool., 32:455-524.

CAIN, A. J.
1956. The genus in evolutionary taxonomy. Syst. Zool., 5:97-109.

1959. Taxonomic concepts. Ibis