at midday. At night on August 5, 1960, numerous
individuals were found calling from leaves of plants growing on the
slopes of the ravine by the streams. None was more than two meters
above the ground. Tadpoles were found in the fast-flowing stream, where
they were holding onto rocks with their mouths. Little is known of the
herpetofauna of these mountains that are the home of the Chamula
Indians. Since the little frog described here comes from the land of
the Chamulas, I propose that it be named:

~_Ptychohyla chamulae_~ new species

(Plate 25, Fig. 2)

_Holotype._--University of Kansas Museum of Natural History
No. 58063, from a stream above (6.2 kilometers by road
south) Rayon Mescalapa, Chiapas, Mexico (1690 meters); one
of a series collected on August 5, 1960, by William E.
Duellman, Dale L. Hoyt, and John Wellman. Original No. WED
17327.

_Paratypes._--KU Nos. 58064-58073 collected with the holotype.

_Diagnosis._--A species of the _schmidtorum_-group of
_Ptychohyla_ differing from other known members of the group
in having the following combination of characters: diameter
of tympanum not noticeably less than half that of eye; white
spot below eye; white lateral stripe on body anteriorly;
dorsum bright green in life; thighs yellowish brown.

_Description of Holotype._--Adult male having snout-vent
length of 27.3 mm.; tibia length, 12.8 mm.; tibia
length/snout-vent length, 48.7 per cent; foot length
(measured from proximal edge of inner metatarsal tubercle to
tip of longest toe), 10.8 mm.; head length, 9.2 mm.; head
length/snout-vent length, 33.7 per cent; head width, 9.0
mm.; head width/snout-vent length, 30.9 per cent; diameter
of eye, 2.8 mm.; diameter of tympanum, 1.4 mm.;
tympanum/eye, 50.0 per cent. Snout in lateral profile nearly
square, slightly rounded above; in dorsal profile bluntly
squared; canthus pronounced; loreal region concave; lips
thick, rounded, and flaring; nostrils protuberant;
internarial distance, 2.3 mm.; top of head flat;
interorbital distance, 3.3 mm.; much broader than width of
eyelid, 2.4 mm. A thin dermal fold from posterior corner of
eye above tympanum to insertion of forelimb, covering upper
edge of tympanum; tympanum nearly round, its diameter equal
to its distance from eye. Forearm slender lacking distinct
fold on