Trivial Name, Original Generic Name, Author, Date Current Name ---------------------------------------------------------------------- _britti (Hyla leprieurii)_ Melin, 1941 _O. leprieurii_ _buckleyi (Hyla)_ Boulenger, 1882 _O. buckleyi_ _cabrerai (Hyla)_ Cochran and Goin, 1970 _O. buckleyi_ _carri (Hyla)_ Cochran and Goin, 1970 _O. buckleyi_ _depressa (Hyla)_ Andersson, 1945 _O. taurinus_ _festae (Hyla)_ Peracca, 1904 _O. buckleyi_ _flavolineatus (Osteocephalus)_ Steindachner, 1862 _O. taurinus_ _leprieurii (Hyla)_ Dumeril and Bibron, 1841 _O. leprieurii_ _orcesi (Hyla)_ Funkhouser, 1956 _O. verrucigerus_ _pearsoni (Hyla)_ Gaige, 1929 _O. pearsoni_ _planiceps (Osteocephalus)_ Cope, 1874 _O. taurinus_ _riopastazae (Hyla)_ Andersson, 1945 _O. verrucigerus_ _taurinus (Osteocephalus)_ Steindachner, 1862 _O. taurinus_ _verrucigera (Hyla)_ Werner, 1901 _O. verrucigerus_ _vilarsi (Hyla)_ Melin, 1941 _O. taurinus_ _Content._--As defined here, the genus contains five known species: _O. buckleyi_ (Boulenger), _O. leprieurii_ (Dumeril and Bibron), _O. pearsoni_ (Gaige), _O. taurinus_ Steindachner, and _O. verrucigerus_ (Werner). _Distribution._--The Guianas and Amazon Basin; also in the upper Orinoco and Magdalena drainages. Most localities are at elevations below 500 m, but the genus ascends the Amazonian slopes of the Andes to elevations of about 1800 m. ANALYSIS OF CHARACTERS _Size and Proportions._--Frogs of the genus _Osteocephalus_ are moderate to large hylids. The largest species is _taurinus_, attaining a snout-vent length of 103.1 mm; the smallest is _pearsoni_, which attains a length of 54.7 mm. Considerable intraspecific geographic variation occurs in adult size, especially in _taurinus_. Females of all species attain a noticeably larger size than males, but no significant differences are apparent in proportions (Table 2). TABLE 2.--Comparison of Size and Proportions in the Species of _Osteocephalus_. (Means are given in parentheses below observed ranges)