During the course of this study I have examined 247 frogs that I
assign to the genus _Ptychohyla_, plus 40 lots of tadpoles and 12
skeletal preparations. Furthermore, I have examined all of the type
specimens. I have studied each of the species and subspecies in the
field and have examined from seven (_P. euthysanota macrotympanum_) to
33 (_P. spinipollex_) living individuals of each species.
Measurements given in the analysis of data and in the descriptions of
the species are those described by Duellman (1956). In the
descriptions of living colors the capitalized names are from Ridgway
(1912). All interpretations of osteological characters are based on
specimens cleared in potassium hydroxide and stained with alizarin
red.
Recordings of the breeding calls were made with a Magnemite Portable
Tape-recorder; audiospectrographs were made on a vibralyzer (Kay
Electric Company) using normal pattern and wide bandwidth.