more webbing on the foot, different arrangement of
anal tubercles, and different coloration.

_Description of Tadpole._--Six tadpoles having fully
developed mouth parts have body lengths of 5.5 to 11.9 mm.
and total lengths of 17.3 to 44.0 mm. The following
description is based on a tadpole (KU 58199) having small
hind limbs, a body length of 10.5 mm., and a total length of
39.0 mm. Body ovoid, only slightly flattened dorsally and
ventrally (Fig. 1); body only slightly deeper than wide;
eyes directed dorsolaterally and slightly protuberant;
nostrils small. Tail long and slender; greatest depth of
tail-musculature two-thirds greatest depth of tail-fin;
tail-musculature extending nearly to tip of tail-fin.

Mouth directed anteroventrally; thin fleshy lips greatly
expanded and forming large suckerlike disc; width of mouth
greater than width of snout and nearly as wide as body.
Outer edge of lips having small papillae; inner surface of
mouth smooth; scattered large papillae, seemingly in rows,
around teeth and beak (Fig. 2). Tooth rows 3/3; the upper
rows subequal in length; upper rows one and three
interrupted medially; lower rows one and two about equal in
length to upper rows; third lower row short. Upper beak
heavy and horn-covered.

[Illustration: FIG. 1. Tadpole of _Ptychohyla chamulae_
(KU 58199). x 2.5.]

[Illustration: FIG. 2. Mouthparts of tadpole of _Ptychohyla chamulae_
(KU 58199). x 16.]

Color (in alcohol) dark brown over entire body and
tail-musculature; a white area near base of tail, and a dark
streak on anterior one-fourth of tail; tail-fin transparent
having brown blotches.

_Remarks_.--Five metamorphosing tadpoles and juveniles (KU
58074, 58234-8) were found at night on vegetation by
streams. Of two completely metamorphosed young each has a
snout-vent length of 15.7 mm. Another having a snout-vent
length of 16.2 mm. has a tail stub 2 mm. long and a
completely metamorphosed mouth. Two others have snout-vent
lengths of 13.6 and 14.1 mm. and tail lengths of 11.5 and
8.1 mm. respectively; in these the mouth parts are
incompletely metamorphosed. The single female available
(UMMZ 121399) contains approximately 60 ovarian eggs, the
largest of which are about 2.5 mm. in diameter.

_Referred Specimens.--Chiapas_: 6