Syrrhopus guttulatus: Boulenger, 1888:204-06.
Syrrhaphus guttulatus: Günther, 1900:317.
Syrraphus guttulatus: Díaz de León, 1904:11.
Syrrhophus guttilatus: Nieden, 1923:399-400. Kellogg, 1932:125, 127-28. Smith and Taylor, 1948:49, 51. Firschein, 1954:52-54. Gorham, 1966:164.
Syrrhophus smithi Taylor, 1940b:43-45, pl. 1 [Holotype.—USNM 108594, from 15 mi. SW Galeana, Nuevo León, México, 1575 m.; collected on October 13, 1939, by Hobart M. Smith]. Smith and Taylor, 1948:49, 51. Firschein, 1954:54-55. Martin, 1958:50. Gorham, 1966:167.
Syrrhophus gaigeae Schmidt and Smith, 1944:80 [Holotype.—FMNH 27361, from the Basin, Chisos Mountains, Brewster Co., Texas; collected on July 24, 1937, by Walter L. Necker].
Syrrhophus petrophilus Firschein, 1954:50-52 [Holotype.—UIMNH 7807, from 5 km. SW San Luis Potosí, San Luis Potosí, México; collected on July 18, 1949, by David Langebartel]. Gorham, 1966:166.
Syrrhophus marnocki: Milstead, Mecham, and McClintock, 1950:548 (in part).
Diagnosis.—Medium-sized frogs, males 20.6-29.0 mm. snout-vent, females 25.7-31.0 mm. snout-vent length; vocal slits in males; digital tips slightly expanded ([Fig. 1]); first and second fingers equal; skin of dorsum smooth to moderately pustular, that of venter smooth; snout blunt; diameter of tympanum 55.1-75.7 per cent that of eye in males, 47.6-61.7 in females; dorsum and flanks cream to gray with light brown to black flecking and vermiculations; thighs usually not banded; interorbital bar present ([Fig. 8]).