Analysis of breeding calls supports the division of the genus _Ptychohyla_ into two groups of species. The call of each member of the _Ptychohyla euthysanota_ group consists of a single long note, whereas the call of species in the _Ptychohyla schmidtorum_ group consists of a series of short notes. Since no differences were found between the calls of subspecies of any given species, the following discussion of breeding calls pertains to species. These calls are described briefly below and at greater length in the systematic accounts farther on. Audiospectrographs of the breeding calls are shown in Plate 11, and comparisons of the characteristics of the calls are given in Table 3. [Illustration: PLATE 11 Audiospectrographs of the breeding calls of the five species of _Ptychohyla_: (A) _P. spinipollex_ (KU Tape No. 41), (B) _P. euthysanota macrotympanum_ (KU Tape No. 48), (C) _P. leonhardschultzei_ (UMMZ Tape No. 525), (D) _P. schmidtorum chamulae_ (KU Tape No. 52), (E) _P. ignicolor_ (UMMZ Tape No. 526).] TABLE 3.--COMPARISON OF THE BREEDING CALLS OF PTYCHOHYLA -------------------------------------------------------------------------- ----------------+----+--------+-----------+---------+---------+----------- | | Notes | Duration | Pulses |Frequency| Dominant Species |Num-|per call| of note | per | range | frequency | ber| group | (seconds) | second | (cps) | (cps) ----------------+----+--------+-----------+---------+---------+----------- _P. spinipollex_| 1 | 1 | .46 | 147 |3000-5100| 4300 | | | | | | _P. euthysanota_| 7 | 1 | .62 | 95.3 |1800-4200| 3070 | | | (.60-.65) | (91-102)| |(3000-3200) | | | | | | _P. leonhard- | 2 | 1 | .79 | 77 |1500-3500| 2750 schultzei_| | | (.62-.95) | (76-78) | |(2700-2800) | | | | | | _P. schmidtorum_| 6 | 8.5[A] | .064 | 110 |1400-5800| 3400 | | (8-9) |(.054-.070)| (96-121)| |(3350-3450) | | | | | | _P. ignicolor_ | 2 | 12[A] | .079 | 126 |1000-5000| 3150 | |(11-13) |(.078-.080)|(123-129)| |(3100-3200) ----------------+----+--------+-----------+---------+---------+----------- [Footnote A: Only an analysis of the long series of calls is given here; see text for explanation.] _P. spinipollex_ (Pl. 11A).--One long note is repeated at intervals of 45 seconds to four minutes and has an average dominant frequency of 4300 cycles per second.