_Note repetition rate._--The rate at which notes in call-groups containing two or more notes are produced varies in _S. baudini_ from 2.5 to 7.1 (average, 3.7) calls per second; _cyanosticta_, 1.8-2.1 (1.9); _phaeota_, 2.0-2.4 (2.2); _puma_, 1.9-2.9 (2.2); _sila_, 1.3-2.4 (1.8); and _sordida_, 1.5-2.6 (2.1). _Smilisca baudini_, which has notes of short duration (0.09 to 0.13 seconds), has the fastest note-repetition rate. Although the individual notes of _S. cyanosticta_ and _S. phaeota_ are relatively long (average, 0.38 and 0.31 seconds, respectively), the intervals between the notes is short; consequently, their note-repetition rates do not differ greatly from those of _S. puma_ and _S. sila_, which have shorter notes (average, 0.13 and 0.16 seconds, respectively) but longer intervals between notes. _Pulse rate._--Pulses vary in frequency from 78 to 240 per second in the calls analyzed (only primary notes in _S. puma_ and _S. sila_), but the variation in any given species is much less than that in the entire genus (Table 8). _Smilisca puma_ is outstanding in having a high pulse rate, which is approached only by that of _S. baudini_. Even in the species having the lowest pulse rates, the pulsations are not audible. The secondary notes produced by _S. puma_ and _S. sila_ have a slower pulse rate than the primary notes; often the pulses are audible. In _S. puma_ the pulse rate of secondary notes is sometimes as low as 48 pulses per second, and in _S. sila_ still lower (as low as 40 pulses per second). The upper limits of pulse rate in the secondary notes in these species merge imperceptibly with the rates of the primary note; consequently, on the basis of pulse rate alone it is not always possible to distinguish primary from secondary notes. _Frequency._--_Smilisca_ produces noisy (as opposed to more musical) calls, and the energy is distributed throughout the frequency spectrum; the calls are poorly modulated, except in _S. sordida_, in which two usually discrete bands of frequency are present (Pl. 11C). For the most part the calls of _Smilisca_ consist of little modified energy of the fundamental frequency and of its harmonics, some of which are emphasized.