om Dos Aguas (UMMZ 119193) are: Dorsal ground color a
medium shade of brown with dark brown flecks; flanks black with silvery
white and pale yellow spots; belly pale yellowish white; throat mottled
with grayish brown; iris pale copper color.

[Illustration: FIG. 8. Tadpole of _Hyla bistincta_ (UMMZ 115231) from
Uruapan, Michoacan. x 2.]

Description of Tadpole: Body somewhat depressed; maximum width of body
slightly more than one-half of body length. Nostrils placed
dorsolaterally and directed anteriorly, situated about midway between
tip of snout and eye. Eyes of moderate size, dorsolateral in position
and directed upwards. Tail about twice as long as body, thrice as long
as deep, and tapering gradually to a rounded tip. Tail-musculature not
extending to tip of tail fin. Spiracle sinistral, lateral, and situated
at midbody. Vent dextral; the cloacal tube extending along ventral part
of tail for a distance equal to about one-eighth of body length (Fig.
8). Average body length of six tadpoles with small hind limb buds, 19.5
mm.; tail length, 38.3 mm. Mouth ventral, its width equal to about
two-thirds of greatest width of body. Lips bordered by two rows of small
papillae; row of larger papillae between upper lip and outer upper
tooth-row, similar row between lower lip and outer lower tooth-row;
laterally these rows degenerating into numerous small papillae. Horny
beaks well developed; upper beak moderately arched and deeply indented;
lower beak slightly indented. Serrations of beaks blunt and peglike,
moderately developed on both beaks, but slightly stronger on lower one.
Tooth-rows 2/3; upper rows nearly equal in length and slightly longer
than lower rows, which are subequal in length; inner upper tooth row
interrupted medially by rounded notch; inner lower tooth-row turned
downward laterally; teeth in all rows about equal in size, but
decreasing in length laterally (Fig. 9).

[Illustration: FIG. 9. Mouthparts of larval _Hyla bistincta_ (UMMZ
115231) from Uruapan, Michoacan. x 15.]

Color in formalin: pale grayish brown dorsally and laterally; pale gray
ventrally; tail-musculature brown; tail-fin translucent with scattered
melanophores most numerous on upper fin.

In most details these tadpoles resemble those of _Hyla robertsorum_
described by Rabb and Mosimann (1955).

Four metamorphosing young have snout-vent lengths of 23.0-23.5 (23.2);
a completely metamorphosed individual has a snout-vent length of 24.8
mm.