_Notes per call-group._--Except for _S. puma_ and _S. sila_, the series of notes produced in any given call of a species of _Smilisca_ is essentially the same; there is no differentiation into primary and secondary notes. _Smilisca cyanosticta_ and _S. phaeota_ emit only one or two relatively long notes per call-group, whereas _S. baudini_ and _S. sordida_ produce as many as 15 and 6 notes, respectively. Males of _S. puma_ and _S. sila_ often produce only the primary note; sometimes this is done several times before the secondary notes are produced. For example, one _S. puma_ (KU 91711; tape No. 379) produced the following number of notes in consecutive call-groups: 1, 1, 1, 1, 2, 2, 3, 1, 4; secondary notes are present in only four of the nine call-groups. A typical series of consecutive call-groups in _S. sila_ (KU 91852; Tape No. 385) has 1, 1, 1, 2, 4, 2 notes per call-group; secondary notes are present in only half of the call-groups. _Smilisca puma_ apparently always produces at least two primary notes before emitting secondary notes; sometimes only primary notes are produced in one series of calls. The number of secondary notes following a given primary varies from one to nine; the modal number is one, and the mean is three in 27 call-groups. _Smilisca sila_ frequently begins a series of calls with two or more primary notes, but sometimes the first primary note is followed immediately by two or more secondary notes. The number of secondary notes following a given primary varies from one to five; the modal number is one, and the average is two in 13 call-groups. _Duration._--The average duration of call-groups consisting of two or more notes is 1.18 seconds in _S. baudini_; 1.02 in _cyanosticta_, 0.91 in _phaeota_, 1.32 in _puma_, 1.48 in _sila_, and 1.29 in _sordida_. Although there is considerable variation in the lengths of the notes (only primary notes in _S. puma_ and _sila_ are considered here), _S. cyanosticta_, _phaeota_, and _sordida_ have noticeably longer notes than do the other species (Table 8). The secondary notes are longer than the primary notes in _S. puma_ (average 0.27 secs. as compared with 0.13 secs.) and in _S. sila_ (average 0.25 secs., as compared with 0.16 secs.).