Table 7.--_Concluded_ ==============================+========+============+========+=====+=====+======== Associate |_S. |_S. |_S. |_S. |_S. |_S. |baudini_|cyanosticta_|phaeota_|puma_|sila_|sordida_ ------------------------------+--------+------------+--------+-----+-----+-------- _Smilisca sila_ | - | - | - | - | X | X _Smilisca sordida_ | - | - | X | - | X | X _Triprion petasatus_ | X | - | - | - | - | - _Cochranella fleischmanni_ | - | - | - | - | X | X _Centrolene prosoblepon_ | - | - | - | - | X | - _Gastrophryne elegans_ | X | - | - | - | - | - _Gastrophryne olivacea_ | X | - | - | - | - | - _Gastrophryne usta_ | X | - | - | - | - | - _Hypopachus alboventer_ | X | - | - | - | - | - _Hypopachus caprimimus_ | X | - | - | - | - | - _Hypopachus inguinalis_ | X | - | - | - | - | - _Hypopachus maculatus_ | X | - | - | - | - | - _Hypopachus oxyrrhinus_ | X | - | - | - | - | - _Hypopachus variolosus_ | X | - | - | - | - | - _Rana palmipes_ | X | - | X | X | - | - _Rana pipiens_ | X | - | - | - | - | - _Rana warschewitschi_ | - | - | X | - | X | X ------------------------------+--------+------------+--------+-----+-----+-------- _Chorus structure._--Limited observations on some of the species of _Smilisca_ show a definite organization of the calling behavior of individuals. _Smilisca baudini_ and _S. phaeota_ call in duets. This is especially noticeable in _S. baudini_, in which the members of a duet often call from sites separated by only a few centimeters. The call of _S. baudini_ consists of a series of like notes (see description of call in following section); the duration of each note is about equal to the interval between notes. Normally one individual utters one note, pauses, and utters a single note again, or series of two or three notes. If there is no response, the first individual often waits several seconds or even several minutes and then repeats the call. The second individual usually responds after the first or second note of the sequence. The notes of the second individual usually are spaced so that they are emitted in the intervals between the notes of the first individual. This can be shown diagrammatically by having the figure "1" represent notes of the first individual and figure "2," the notes of the second; an empty interval is represented by "0":