ecimens from Uruapan, Michoacan, the
coloration of the flanks and anterior surfaces of the thighs varies
from nearly uniform creamy yellow with only fine dark reticulations to
bold reticulations enclosing yellow spots. Some specimens from Oaxaca
and Veracruz have slightly different markings on the flanks; in these
the dark pigment is in the form of irregular spots or dashes, instead
of reticulations.

There is considerable variation in color in the living frogs. The
dorsum varies from greenish tan and pale yellowish tan to reddish
brown, and some individuals are dark chocolate brown.

_Remarks._--Shannon (1951:470) named _Hyla bistincta labeculata_ on
the basis of a single male from San Lucas Camotlan, Oaxaca; he
diagnosed the subspecies as differing from _Hyla bistincta bistincta_
by having "the gray reticulation of the sides entirely broken up into
elongate black blotches; tarsal fold moderately elevated." The
condition of the tarsal fold is characteristic of the species. The
dispersion of dark pigment on the flanks is variable. The type of
_Hyla bistincta labeculata_ (USNM 123689) is extreme in the
development of dark dashes on the flanks, but this condition is
approached in several specimes from Oaxaca and Veracruz. For example,
in some specimens from Cumbres de Acultzingo, Veracruz, the mottling
on the flanks is bold; in others the flanks are reticulated. The
specimen from San Vicente, Oaxaca, has black dashes on the flanks
(Smith and Williams, 1963:23), whereas a specimen from Cerro San
Felipe, Oaxaca, has no pattern on the flanks. In general, specimens
from western Mexico have reticulate mottling on the flanks as compared
with the marbling on the flanks in specimens from eastern Mexico. On
the basis of available data, the recognition of subspecies in _Hyla
bistincta_ is unwarranted.

The tadpoles of this species described by Duellman (1961:47) are like
those of _Hyla robertsorum_ in having 2/3 tooth-rows, peglike
serrations on the beaks, and long, rounded tails. At Uruapan tadpoles
were found in a rocky stream on April 24, 1956, and metamorphosing
young were found there on August 2, 1956. A completely metamorphosed
juvenile has a snout-vent length of 24.8 mm.

_Hyla bistincta_ is found only along streams, where individuals can be
seen clinging to vines and other vegetation closely over-hanging
fast-moving parts of the stream.

_Distribution._--_Hyla bistincta_ occurs at elevations from 1400 to
2600 meters