edge of the pond, whereas _Hyla microcephala_ called from emergent
vegetation in the middle of the pond. Charles W. Myers informed me that
at Penonome, Cocle, Panama, he found _staufferi_ calling from grass in
puddles where _microcephala_ was absent, and at El Cano, Cocle, Panama,
_staufferi_ was calling from higher sites ("several inches to a few
feet above water") than _microcephala_.

Stuart (1948:34) reported breeding individuals from La Libertad,
Guatemala, after rainfall in late May, and Schmidt and Stuart
(1941:239) reported _staufferi_ breeding in July in the Salama basin,
Alta Verapaz, Guatemala. Stuart (1935:38) and Duellman (1960:63 and
1963:226) agreed that this species breeds early in the rainy season.
However, Rand (1957:519) stated that in El Salvador "these frogs did
not begin to call until almost a month and a half after the beginning
of the rains." Blair (1960:133) reported that males call in June and
July in Chiapas, Oaxaca, Veracruz, and Tamaulipas, Mexico.

The mating call of this species is a series of closely spaced notes
having a fundamental frequency of about 100 cycles per second. Each
note has a duration of 0.13 to 0.23 second, repeated at intervals that
are longer than the duration of the call. The notes are moderately
low-pitched and have a dominant frequency of more than 3,000 cycles per
second and about 120 pulses per second (Table 2).

_Tadpoles._--Measurements of the 33 tadpoles that are available are
given in Table 8. The largest tadpole examined is in stage 38 and has a
total length of 29.5 mm.

A typical tadpole in stage 38 of development (KU 104162, 5 km ESE
Cordoba, Veracruz, Mexico) has a body length of 10 mm., tail length of
19.5 mm., and a total length of 29.5 mm. Other characters are as
follows: body as deep as wide, depressed anteriorly; body as long as
depth of tail; interorbital space greater than distance between eye and
snout but equal to internarial space; nostril equidistant between eye
and tip of snout; distance between spiracle and eye less than distance
between eye and snout; eyes large, situated dorsolaterally; mouth
anteroventral, approximately triangular in outline; one row of papillae
covering lower lip and all except median fourth of upper lip; scattered
papillae at corners of mouth; tooth rows 2/3; first upper row entire,
second row interrupted medially, shorter than first; lower rows shorter
than upper rows; beak weak; spiracle short and nearer eyes than anus