Tadpoles and metamorphosing young were found at Finca La Paz, Guatemala, in late July, 1960. Two young lacking tails but not having completely developed mouths have snout-vent lengths of 14.2 and 14.6 mm. L. C. Stuart collected four metamorphosing young at Finca La Paz on May 6, 1949. By May 10 the frogs were completely metamorphosed, at which time they had snout-vent lengths of 15.5 to 17.0 (average 16.1) mm. _Remarks._--There is no doubt that this frog is most closely related to _Ptychohyla schmidtorum chamulae_, even though the ranges of the two subspecies are separated by the interior depression of Chiapas. Since at least at Finca La Paz, Guatemala, _P. s. schmidtorum_ occurs with _P. e. euthysanota_, it is surprising that the former species has not been found at more localities along the Pacific slopes on northern Central America. At Finca La Paz in July, 1960, _P. s. schmidtorum_ was more abundant than _P. e. euthysanota_. _Distribution._--This species is known only from a limited area at elevations between 1300 and 2200 meters on the Pacific slopes of the Sierra Madre in extreme eastern Chiapas and western Guatemala. _Specimens examined._--MEXICO: _Chiapas_: Finca Irlandia, UMMZ 105429-30. GUATEMALA: _San Marcos_: El Porvenir, CNHM 20755, 20761, 69904, UMMZ 80918; Finca La Paz, 2 km. W of La Reforma, KU 58016-44, 59940-2 (skeletons), 60050 (3 young), 60051 (tadpoles), 60052 (4 young), MCZ 34998-9, UMMZ 123144-7 (tadpoles). [Illustration: PLATE 17 _Ptychohyla schmidtorum chamulae_ (KU 58069). x 2.] =Ptychohyla schmidtorum chamulae= Duellman _Ptychohyla chamulae_ Duellman, Univ. Kansas Publ. Mus. Nat. Hist., 13: 354-357, pl. 25, fig. 2, April 27, 1961 [Holotype.--KU 58063 from 6.2 kilometers south of Rayon Mescalapa, Chiapas, Mexico; William E. Duellman collector]. _Diagnosis._--Vomerine teeth 4-6; dorsum bright green; white lateral stripe; eye reddish bronze in life.