ye ratio is 48.2 to 58.6 per cent (average,
53.2 per cent). The number of vomerine teeth varies from
four to six. The extent of the ventrolateral glands is
variable. In five specimens the glands nearly meet
midventrally; in two others the glands include the axillary
region; in none do the glands extend into the groin. In
other structural details there is no noticeable variation.

The greatest variation in color pattern is found in the
lateral stripe. The pale spot or bar below the eye is
present in all specimens; in one individual there is no
lateral stripe; in three the stripe extends posteriorly only
to above the forearm, in two to the mid-flank, and in the
others to the groin.

Although all of the males were bright uniform green above
when collected at night as they were calling, some changed
color later. In these individuals the dorsum became a
somewhat paler green with faint irregular yellowish tan
blotches.

The one 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,