the squamosal by the cartilaginous crista parotica. The squamosal is
large; the anterior arm is pointed. The posterior arm of the squamosal
is broad, rounded terminally, and articulates with the prooetic
medially.

The prevomer is short and separated anteriorly from the premaxillary
and maxillary by cartilage. The posterior margin of the prevomer has a
bony articulation with the sphenethmoid. Each prevomer bears five to
seven teeth. The palatine is small and edentate. The anterior end of
the parasphenoid is narrow (more pointed than in _Hyla boulengeri_).
The pterygoid is slender and well developed (Fig. 5A).

[Illustration: Fig. 5. Dorsal views of the skulls of (A) _Hyla
foliamorta_ (KU 77687) and (B) _H. elaeochroa_ (KU 68289), x 3.]

_Natural History._--_Hyla foliamorta_ inhabits lowland forests in
eastern Panama and breeds in temporary ponds. Males have been observed
calling from grasses, bushes, and emergent vegetation near temporary
ponds and ditches along roads. William E. Duellman informed me that he
found a breeding congregation of this species in June near Chepo,
Panama, where males were calling from spiny palms at the edge of a
woodland pond. Fouquette (1958) found calling males in May, August,
and September near Miraflores Locks, Canal Zone. Calling stations vary
from one to two meters above ground. No clasping pairs have been
found; only one female is known (KU 101589, from 8 km NE Tocumen,
Panama); this gravid individual was collected in early June.

The mating call of _Hyla foliamorta_ consists of one pulsed,
low-pitched, moderate trill of about O.5 second duration. Each note is
repeated at intervals of 5 seconds to a few minutes. The notes have
about 50 pulses per second, a fundamental frequency of 56 cycles per
second and a dominant frequency of about 3000 cycles per second (Table
2, Pl. 3B).

Egg deposition sites are unknown. No information is available
concerning early development, and little is known about the breeding
season of _Hyla foliamorta_. Probably its breeding activities are
restricted to the rainy months.

_Tadpoles._--Eight tadpoles were collected from a weedy temporary pond
near Chepo, Panama, in early June.

A typical tadpole in stage 35 of development (KU 104244) has a body
length of 9.5 mm., tail length of 25.0 mm., and a total length of 34.5
mm. Other characters are as follows: depth of tail equal to length of
body; body deeper than wide; distance between eye and nostril