Ground color pale reddish-brown to tan dorsally, creamy on flanks; dorsal pattern consisting of reddish-brown to brown vermiculations extending onto flanks; distinct interorbital light bar present; loreal region darker than snout, reddish-brown compared to tan or pale reddish-brown; arms colored like dorsum; thighs banded, unicolor brown on posterior surfaces; shanks and tarsi banded; venter white to cream punctated with brown in some specimens. The variation in proportions is summarized in Table 5. _Remarks._--Martin (1958) expressed some doubt that this series of 26 specimens was identical with "_S. latodactylus_." My study indicates that the specimens from El Pachon represent a distinctive but allied species. Males of the two species can be readily separated by the relative sizes of the tympani, presence or absence of vocal slits, and color pattern. Females of the two species can be separated by color pattern. Within the type-series, the pattern varies from weakly to strongly vermiculate but is always recognizable as vermiculate rather than spotted as in _S. longipes_ (= _S. latodactylus_ of Taylor and Martin). [Illustration: FIG. 12: _Syrrhophus dennisi_ sp. nov., holotype, UMMZ 101121 (dorsum x1.8, side of head x6.1).] _Etymology._--The specific name is a patronym for David M. Dennis, whose drawings greatly enhance the worth of this paper. _Distribution._--Known only from the type series. =Syrrhophus longipes= (Baird), New combination _Batrachyla longipes_ Baird, 1859:35, pl. 37, fig. 1-3 [Holotype.--apparently USNM 3237 (cited as 3207 by Cope, 1887:16), now lost, from 40 Leagues from (probably north) Mexico City; collected by John Potts]. Kellogg, 1932:107. _Epirhexis longipes_: Cope, 1866:96. _Eleutherodactylus longipes_: Kellogg, 1932:107 (part). Smith and Taylor, 1948:61. Lynch, 1963:580-581. Gorham, 1966:82. _Syrrhophus latodactylus_ Taylor, 1940d:396-401, pl. 43, figs. A-F, text fig. 7 [Holotype.--FMNH 100063 (formerly EHT-HMS 6807), from Huasteca Canyon, 15 km. W Monterrey, Nuevo Leon, Mexico, 680 m.; collected on June 20, 1936, by Edward H. Taylor]. Smith and Taylor, 1948:50-52. Martin, 1958:48-50. Gorham, 1966:165. _Diagnosis._--Large frogs, males 22.1-33.2 mm. snout-vent, females 26.8-39.6 mm. snout-vent length; vocal slits lacking in males; digital tips greatly expanded (more than twice the width of digit); first finger shorter than second; skin of dorsum pustular, that of venter smooth; diameter of tympanum in males 61.1-87.2 per cent that of eye, 49.5-72.1 per cent in females; dorsum tan with large or small spots and blotches; limbs banded; interorbital bar or triangle present.