The coloration of four males in life from Lago Agrio, Ecuador (KU 126652-5) was: "Dorsal ground color tan to dark brown with darker brown markings. Flanks creamy tan to yellow with brown or black flecks or mottling. Venter uniform creamy yellow or yellow with brown spots or reticulations. Iris greenish yellow with radiating black streaks and a median, horizontal reddish brown streak." (W. E. Duellman, field notes, 12 May 1969.) A female from Santa Cecilia, Ecuador (KU 123173), was: "Dorsum mottled olive-green and tan. Flanks tan with brown spots. Belly and throat creamy white, becoming tan posteriorly. Edge of upper jaw olive-green." (W. E. Duellman, field notes, 16 June 1968.) Another female from Santa Cecilia (KU 123175), was: "Brown dorsally with cream-colored mottling. Transverse bars on legs darker brown with cream-colored edges. Margin of upper lip creamy yellow. Anterior and posterior surfaces of thighs tan. Flanks white with brown spots. Venter creamy white. Iris greenish bronze with heavy radiating reticulations of black." (W. E. Duellman, field notes, 22 July 1968.) The tendency for females to have a labial stripe posteriorly and the absence of dorsal tubercles in females has resulted in the identification of many such specimens as _O. leprieurii_. Ontogenetic change in coloration is slight in _taurinus_. Most juveniles (less than 40 mm in snout-vent length) can be identified readily. There is a tendency for the dorsal markings of juveniles to consist of several small spots. Apparently with growth the spots usually coalesce, forming a large median blotch, but some adults retain the juvenile pattern. Cochran and Goin (1970:251) erroneously identified several juveniles from Colombia as _Hyla palpebrogranulata_ Andersson. =Osteocephalus verrucigerus= (Werner) _Hyla verrucigera_ Werner, 1901:601 [Holotype.--ZMB 16589 from "Ecuador"; Richard Haensch collector]. _Hyla riopastazae_ Andersson, 1945:72 [Holotype.--NHRM 1960 from Banos, Rio Pastaza, Provincia Tungurahua, Ecuador; William Clarke-MacIntyre collector]. _Hyla orcesi_ Funkhouser, 1956:78 [Holotype.--CAS-SU 13150 from Rio Pacayacu, tributary of Rio Cotapino, Provincia Napo, Ecuador; collector unknown]. _Osteocephalus orcesi_--Cochran and Goin, 1970:317. _Osteocephalus verrucigerus_--Trueb and Duellman, 1970:601 [Synonymized _Hyla riopastazae_ Andersson, 1945, and _Hyla orcesi_ Funkhouser, 1956, with _Hyla verrucigera_ Werner, 1901]. _Justification of Synonymy._--Trueb and Duellman (1970:605) discussed the assignment of the names in the synonymy of _O. verrucigerus_; only a brief resume is given here.