| 1. | Larger frogs ([M] to 76 mm., [F] to 90 mm.) having broad flat heads and a dark brown or black postorbital mark encompassing tympanum |
| 2 | |
| Smaller frogs ([M] to 45 mm., [F] to 64 mm.) having narrower heads and lacking a dark brown or black postorbital mark encompassing tympanum | |
| 4 | |
| 2. | Lips barred; flanks cream-colored with bold brown or black mottling in groin; posterior surfaces of thighs brown with cream-colored flecks |
| [S. baudini, p. 289] | |
| Lips not barred; narrow white labial stripe present; flanks not cream-colored with bold brown or black mottling in groin; posterior surfaces of thighs variable | |
| 3 | |
| 3. | Flanks and anterior and posterior surfaces of thighs dark brown with large pale blue spots on flanks and small blue spots on thighs |
| [S. cyanosticta, p. 303] | |
| Flanks cream-colored with fine black venation; posterior surfaces of thighs pale brown with or without darker flecks or small cream-colored spots | |
| [S. phaeota, p. 308] | |
| 4. | Fingers having only vestige of web; diameter of tympanum two-thirds that of eye; dorsum pale yellowish tan with pair of broad dark brown stripes |
| [S. puma, p. 314] | |
| Fingers about one-half webbed; diameter of tympanum about one-half that of eye; dorsum variously marked with spots or blotches | |
| 5 | |
| 5. | Snout short, truncate; vocal sacs in breeding males dark gray or brown; blue spots on flanks and posterior surfaces of thighs |
| [S. sila, p. 318] | |
| Snout long, sloping, rounded; vocal sacs in breeding males white; cream-colored or pale blue flecks on flanks and posterior surfaces of thighs | |
| [S. sordida, p. 323] | |
| 1. | Pond tadpoles; tail about half again as long as body; mouth anteroventral |
| 2 | |
| Stream tadpoles; tail about twice as long as body; mouth ventral | |
| 5 | |
| 2. | Labial papillae in two rows |
| 3 | |
| Labial papillae in one row | |
| 4 | |
| 3. | First upper tooth row strongly arched medially; third lower tooth row much shorter than other rows; dorsal fin deepest at about two-thirds length of tail; tail cream-colored with dense gray reticulations |
| [S. puma, p. 314] | |
| First upper tooth row not arched medially; third lower tooth row nearly as long as others; dorsal fin deepest at about one-third length of tail; tail tan with brown flecks and blotches | |
| [S. baudini, p. 289] | |
| 4. | Dorsal fin extending onto body |
| [S. phaeota, p. 308] | |
| Dorsal fin not extending onto body | |
| [S. cyanosticta, p. 303] | |
| 5. | Mouth completely bordered by two rows of papillae; inner margin of upper beak not forming continuous arch with lateral processes; red or reddish brown markings on tail |
| [S. sordida, p. 323] | |
| Median part of upper lip bare; rest of mouth bordered by one row of papillae; inner margin of upper beak forming continuous arch with lateral processes; dark brown markings on tail | |
| [S. sila, p. 318] | |
Smilisca baudini (Duméril and Bibron)
Hyla baudini Duméril and Bibron, Erpétologie général, 8:564, 1841 [Holotype.—MNHN 4798 from "Mexico;" Baudin collector]. Günther, Catalogue Batrachia Salientia in British Museum, p. 105, 1858. Brocchi, Mission scientifique au Mexique ..., pt. 3, sec. 2, Études sur les batrachiens, p. 29, 1881. Boulenger, Catalogue Batrachia Salientia in British Museum, p. 371, Feb. 1, 1882. Werner, Abhand. Zool.-Bot. Gesell. Wien., 46:8, Sept. 30, 1896. Günther, Biologia Centrali-Americana: Reptilia and Batrachia, p. 270, Sept. 1901. Werner, Abhand. Konigl. Akad. Wiss. Munchen, 22:351, 1903. Cole and Barbour, Bull. Mus. Comp. Zool., 50(5):154, Nov. 1906. Gadow, Through southern México, p. 76, 1908. Ruthven, Zool. Jahr. 32(4):310, 1912. Decker, Zoologica, 2:12, Oct., 1915. Stejneger and Barbour, A checklist of North American amphibians and reptiles, p. 32, 1917. Noble, Bull. Amer. Mus. Nat. Hist., 38(10):341, June 20, 1918. Nieden, Das Tierreich, Amphibia, Anura I, p. 243, June, 1923. Gadow, Jorullo, p. 54, 1930. Dunn and Emlen, Proc. Acad. Nat. Sci. Philadelphia, 84:24, March 22, 1932. Kellogg, Bull. U. S. Natl. Mus., 160:160, March 31, 1932. Martin, Aquarien Berlin, p. 92, 1933. Stuart, Occas. Papers Mus. Zool., Univ. Michigan, 292:7, June 29, 1934; Misc. Publ. Mus. Zool. Univ. Michigan, 29:38, Oct. 1, 1935. Gaige, Carnegie Inst. Washington, 457:293, Feb. 5, 1936. Gaige, Hartweg, and Stuart, Occas. Papers Mus. Zool. Univ. Michigan, 360:5, Nov. 20, 1937. Smith, Occas. Papers Mus. Zool. Univ. Michigan, 388:2, 12, Oct. 31, 1938; Ann. Carnegie Mus., 27:312, March 14, 1939. Taylor, Copeia, 2:98, July 12, 1939. Hartweg and Oliver, Misc. Publ. Mus. Zool. Univ. Michigan, 47:12, July 13, 1940. Schmidt and Stuart, Zool. Ser. Field Mus. Nat. Hist., 24(21):238, August 30, 1941. Schmidt, Zool. Ser. Field Mus. Nat. Hist., 22(8):486, Dec. 30, 1941. Wright and Wright, Handbook of frogs and toads, Ed. 2, p. 134, 1942. Stuart, Occas. Papers Mus. Zool. Univ. Michigan, 471:15, May 17, 1943. Bogert and Oliver, Bull. Amer. Mus. Nat. Hist., 83(6):343, March 30, 1945. Taylor and Smith, Proc. U. S. Natl. Mus., 95(3185): 590, June 30, 1945. Smith, Ward's Nat. Sci. Bull., 1, p. 3, Sept., 1945. Schmidt and Shannon, Fieldiana, Zool. Chicago Nat. Hist. Mus., 31(9):67, Feb. 20, 1947. Stuart, Misc. Publ. Mus. Zool. Univ. Michigan, 69:26, June 12, 1948. Wright and Wright, Handbook of frogs and toads, Ed. 3, p. 298, 1949. Stuart, Contr. Lab. Vert. Biol. Univ. Michigan, 45:22, May, 1950. Mertens, Senckenbergiana, 33:170, June 15, 1952; Abhand. Senckenb. Naturf. Gesell., 487:28, Dec. 1, 1952. Schmidt, A checklist of North American amphibians and reptiles, Ed. 6, p. 69, 1953. Stuart Contr. Lab. Vert. Biol. Univ. Michigan, 68:46, Nov. 1954. Zweifel and Norris, Amer. Midl. Nat., 54(1):232, July 1955. Martin, Amer. Nat., 89:356, Dec. 1955. Duellman, Copeia, 1:49, Feb. 21, 1958. Goin, Herpetologica, 14:119, July 23, 1958. Turner, Herpetologica, 14:192, Dec. 1, 1958. Conant, A field guide to reptiles and amphibians, p. 284, 1958. Duellman, Univ. Kansas Publ., Mus. Nat. Hist., 13(2):59, Aug. 16, 1960; Univ. Kansas Publ., Mus. Nat. Hist., 15(1): 46, Dec. 20, 1961. Porter, Herpetologica, 18:165, Oct. 17, 1962.
Hyla vanvlietii Baird, Proc. Acad. Nat. Sci. Philadelphia, 7:61, April 27, 1854 [Holotype.—USNM 3256 from Brownsville, Cameron County, Texas; S. Van Vliet collector]. Baird, United States and Mexican boundary survey, 2:29, 1859. Smith and Taylor, Univ. Kansas Sci. Bull., 33:361, March 20, 1950. Cochran, Bull. U. S. Natl. Mus., 220:60, 1961.
Hyla vociferans Baird, United States and Mexican boundary survey, 2:35 1859 [nomen nudum]. Diáz de León, Indice de los batracios que se encuentran en la República Mexicana, p. 20, June 1904.
Hyla muricolor Cope, Proc. Acad. Nat. Sci. Philadelphia, 14(9):359, 1862 [Holotype.—USNM 25097 from Mirador, Veracruz, México; Charles Sartorius collector]. Smith and Taylor, Univ. Kansas Sci. Bull., 33:349, March 20, 1950. Cochran, Bull. U. S. Natl. Mus., 220:56, 1961.