_Specimens examined._--(48) MEXICO, _Jalisco_: 17.6 km. SW Autlan, 606 m., KU 102626, 102631; 6.4 km. W Atenquique, 2060 m., KU 102628-30, 102632; 8 km. W Atenquique, 1970 m., LACM 3210-12; 9.6 km. W Atenquique, 2360 m., LACM 3200 (holotype), 3201-09; 14.5 km. W Atenquique, 2000 m., LACM 25424-36, 25439-41, 25446; 15 km. W Atenquique, LACM 37044-46, 37244-47; 16 km. W Atenquique, 2105 m., LACM 25443-45; 17 km. W Atenquique, 2180 m., LACM 25442. =Syrrhophus pallidus= Duellman, New combination _Syrrhophus modestus_: Davis and Dixon, 1957:146. _Syrrhophus modestus pallidus_ Duellman, 1958:2-3, 5-7, 14, pl. 3 [Holotype.--UMMZ 115452, from San Blas, Nayarit, Mexico, sea level; collected on August 13, 1956, by William E. and Ann S. Duellman]. Zweifel, 1960:86-88, 91, 93-94, 118, 120-22. Gorham, 1966:166. _Syrrhophis modestus pallidus_: Campbell and Simmons, 1962:194. _Diagnosis._--Small frogs, males 17.9-19.3 mm. snout-vent length; vocal slits in males; finger tips widely expanded; first finger shorter than second; inner metatarsal tubercle about three times size of outer; skin of dorsum shagreened, that of venter smooth; tympanum concealed, its diameter 27.0-35.6 per cent of eye in males; ground color cream vermiculated with brown, upper arm and thigh lacking, or with few, indistinct, bands; interorbital bar absent. _Remarks._--Considerable debate has been waged relative to the value of subspecies and to the reasons for recognizing distinct disjunct populations as species versus subspecies. Lacking evidence of genetic exchange, I prefer to retain disjunct populations that are distinctive as species. All known specimens of _pallidus_ can be separated from those of _modestus_ by color pattern. The two nominal species exhibit overlap in proportions but the same can be said about nearly every species of _Syrrhophus_; therefore, overlap in proportions can be disregarded in assessing specific versus subspecific rank. Until contrary evidence is forthcoming, I consider the disjunct populations heretofore held to be subspecies of _modestus_ to be specifically distinct. The specimens of the disjunct population of _pallidus_ on the Tres Marias do not differ from the mainland population in Nayarit. This evidence, though perhaps secondary, supports my contention that two species should be recognized. _Etymology._--Latin, in reference to the pale ground color in comparison with that of _S. modestus_. _Distribution._--Low elevations in coastal Nayarit and on Islas Tres Marias (Fig. 20). _Specimens examined._--(12) MEXICO, _Nayarit_: 18.8 mi. NW Ahuacatlan, UIMNH 7808; San Blas, UMMZ 115452 (holotype), 115453-57; 17 km. NE San Blas, 150 m., MSU 5085; 12.8 km. E San Blas, UIMNH 71979; 31 km. E San Blas, UIMNH 71978; 13.5 km. N Tepic, UIMNH 71980-81. =Syrrhophus teretistes= Duellman