ing occurs at any time from late May through August and is
controlled by the distribution of rainfall. Heavy precipitation,
especially rains of two inches or more, stimulates the frogs to migrate
in large numbers to breeding ponds. Even though there are several well
spaced periods of unusually heavy rainfall in the course of a summer,
each one initiates a new cycle of migration, mating and spawning. Heavy
rainfall is a necessity, not only to ensure a water supply in temporary
pools where the frogs breed, but to create the moist conditions they
require for an overland migration. An individual male may migrate to a
pond and breed at least twice in the same season. Whether or not the
females do likewise is unknown. Amplexus and spawning occur mainly
within a day or two after the frogs reach the ponds. The males call
chiefly at night, but there may be daytime choruses when breeding
activity is at its peak. Many males concentrate within a few square
yards in the choruses and float upright usually beside or beneath a stem
or leaf, or other shelter, rendering them extremely inconspicuous. The
call is a bleat of three seconds duration, or a little more. In amplexus
the members of a pair sometimes become glued together by their viscous
dermal secretions. The eggs hatch in approximately 48 hours. The
tadpoles metamorphose in as few as 24 days. Newly metamorphosed frogs
are 15 to 16 mm. in length, or, rarely as small as 14.5 mm. They are
thus much larger than newly metamorphosed _G. carolinensis_, which have
been described as 10-12 mm. or even as small as 8.5 mm. The newly
metamorphosed frogs disperse from the breeding ponds as soon as there is
a heavy rain. The young grow a little more than one mm. in length per
week. Those metamorphosed in early summer may attain minimum adult size
before hibernation which begins in October. It seems that sexual
maturity is most often attained in the second season, at an age of one
to two years.

_Gastrophryne_ belongs to a family that is primarily tropical in
distribution, and frogs of this genus have much higher temperature
thresholds than most other amphibians of northeastern Kansas, with a
correspondingly short season of activity. For more than half the year,
mid-October to early May the frogs are normally in hibernation. Body
temperatures of active frogs ranged from 17.0 deg. C. to 37.6 deg. C.,
but more than two-thirds were within the relatively narrow range, 24.0
deg. to 31 deg.. Near the