available female (UMMZ 121399) has a snout-vent length of 30.3 mm. and a tympanum/eye ratio of 52.8 per cent, and is colored like the males. The tubercles by the anal opening are placed irregularly and do not consist of two pairs below the opening. There are no ventrolateral glands, glandular area on the chin, or enlarged prepollex.

Comparisons.—Ptychohyla chamulae resembles P. schmidtorum in color pattern and body proportions, but the ground color of schmidtorum is chocolate brown and not green as in chamulae. Also, in schmidtorum the webbing and posterior surfaces of the thighs are pale cream-color in preserved specimens as contrasted with tan in chamulae. In living schmidtorum the iris is bright red, not reddish bronze as in chamulae. The ventrolateral glands in schmidtorum more closely approximate one another midventrally than in chamulae. It is conceivable that these populations are subspecifically related; schmidtorum occurs in the same kind of habitat as does chamulae, but is known only from the Pacific slopes of southeastern Chiapas and southwestern Guatemala, whereas chamulae is known only from the Atlantic slopes of the Mesa Central in north-central Chiapas. Both of these species differ from Ptychohyla ignicolor in having a relatively larger tympanum, 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.

Fig. 1. Tadpole of Ptychohyla chamulae (KU 58199). × 2.5.

Fig. 2. Mouthparts of tadpole of Ptychohyla chamulae (KU 58199). × 16.