Excluding the beak, skulls of the white-wing and Mourning doves are of nearly the same shape. Previous investigators have shown that in _Zenaida_ and _Zenaidura_ plumage patterns are similar, nesting habits and eggs are nearly identical, blood proteins are similar, and one "intergeneric" hybridization in nature is known. Consequently, it is concluded that species of the two alleged genera are congeneric, and I agree with Goodwin (1958) that the genus _Zenaida_ (Bonaparte, 1838:41) should include the Mourning Dove, Eared Dove, Socorro Dove, Zenaida Dove, and White-winged Dove. Their Latin binomina are _Zenaida macroura_, _Zenaida auriculata_, _Zenaida graysoni_, _Zenaida aurita_, and _Zenaida asiatica_, respectively. [Illustration: FIG. 1. Medial view of left ramus of lower mandible of Mourning Dove. x 2-1/2. FIG. 2. Lateral view of right ramus of lower mandible of Mourning Dove. x 2-1/2.] [Illustration: FIG. 3. Dorsal view of lower mandible of Mourning Dove. x 2-1/2. FIG. 4. Ventral view of lower mandible of Mourning Dove. x 2-1/2.] [Illustration: FIG. 5. Dorsal view of right quadrate of Mourning Dove. x 5. FIG. 6. Dorsal view of right pterygoid of Mourning Dove. x 5. FIG. 7. Ventral view of right quadrate of Mourning Dove. x 5. FIG. 8. Ventral view of right pterygoid of Mourning Dove. x 5.] [Illustration: FIG. 9. Right lateral view of skull of Mourning Dove. x 2-1/2. FIG. 10. Ventral view of skull of Mourning Dove. x 2-1/2.] [Illustration: FIG. 11. Cross section of skull of Mourning Dove; anterior view. x 2-1/2. FIG. 12. Dorsal view of right quadrate of Mourning Dove showing movement which protracts the upper mandible (broken line). x 5.] [Illustration: FIG. 13. Right lateral view of the jaw musculature of the White-winged Dove; superficial layer, x 5. FIG. 14. Right lateral view of the jaw musculature of the Mourning Dove; superficial layer. x 5.] [Illustration: FIG. 15. Dorsal view of the jaw musculature 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.