_Diagnosis._--Medium-sized frogs, males 17.5-26.1 mm. snout-vent, females 28.0-31.7 mm. snout-vent length; vocal slits in males; digital tips slightly expanded; first finger shorter than second; skin of dorsum pustular, that of venter areolate; snout elongate, subacuminate; diameter of tympanum 56.1-76.7 per cent that of eye in males, 54.3-56.8 in females; in preservative, dorsum reddish brown with numerous small black or dark brown spots (Fig. 8); venter white to cream; in life dorsum green with darker green spots, belly white; iris gold above, bronze below. _Remarks._--Cope's (1885) original description was not sufficiently clear to enable subsequent authors to recognize this species. Taylor (1940e) described it as a _Tomodactylus_, but Dixon (1957) pointed out that _T. macrotympanum_ differed from the other species of the genus in having a poorly developed lumbo-inguinal (inguinal) gland, and placed the species in the genus _Syrrhophus_. Comparison of the holotypes of _S. verrucipes_ and _T. macrotympanum_ leaves no doubt in my mind that a single species is involved. This same species was reported by Smith and Taylor (1948) as _S. verruculatus_. _Syrrhophus verrucipes_ bears resemblance to members of both the _leprus_ and _marnockii_ groups. In snout shape it is closer to the _leprus_ group, whereas in digital pad, the shape of the general body form, and contiguity of habitat it is most similar to the _marnockii_ group (_S. guttilatus_). _Etymology._--Latin, meaning warty foot, probably in reference to the numerous plantar supernumerary tubercles. _Distribution._--Moderate elevations in southeastern San Luis Potosi, Queretaro, and northwestern Hidalgo, Mexico (Fig. 7). _Specimens examined_--(43) MEXICO, _Hidalgo_: Jacala, UMMZ 106434; 9.6 km. NE Jacala, Puerto de la Zorra, 1820 m., KU 60240-41, TCWC 11090, 11147; 8 km. S Jacala, La Placita, 1850 m., FMNH 100049 (holotype of _Tomodactylus macrotympanum_), 100791-803, 105334-35, 114287, UIMNH 15989-92, 15995-96, UMMZ 117252, USNM 137202; Tianguistengo, FMNH 113705-09, UIMNH 13328-30; near Zacualtipan, ANSP 11325 (holotype of _Syrrhophus verrucipes_). _Queretaro_: 3.5 km. S San Juan del Rio, EAL 1343. _San Luis Potosi_: 9.6 km. W Ahuacatlan, LSUMZ 4968-70. =Syrrhophus dennisi= new species _Syrrhophus latodactylus_: Martin, 1958:49 (in part). _Holotype._--UMMZ 101121, adult male from a cave near El Pachon, 8 km. N Antiguo Morelos, Tamaulipas, Mexico, 250 m., collected on March 13, 1949, by Paul S. Martin. _Paratopotypes._--(26). UMMZ 101122 (10), 101123 (2), 101126, 126993 (12).