Examined male song characters in close related Isophya species: syllable duration - SD syllable total duration - STD syllable group duration - SGD syllable group total duration - SGTD gap between successive syllables - GS gap between successive syllable groups - GSG impulse - I impulse period - IP number of impulses per syllable - NI after–click - AC delay of after–click (-s) - DAC number of after–clicks - NAC syllable type A duration - ASD syllable type A total duration - ASTD syllable type B duration - BSD syllable type B total duration - BSTD gap between successive A syllables - GAA gap between A and B syllables - GAB number of impulses in syllable type A - NIA number of impulses in syllable type B - NIB delay of after–click (-s) after syllable type A - DACA delay of after–click (-s) after syllable type B - DACB number of after–clicks after syllable type A - NACA number of after–clicks after syllable type B - NACB duration of syllable component 1 - SDC1 duration of syllable component 2 - SDC2 duration of syllable component 3 - SDC3 gap between component 1 and 2 in a syllable - GC12 gap between component 2 and 3 in a syllable - GC23 number of impulses in syllable component 1 - NIC1 number of impulses in syllable component 2 - NIC2 number of impulses in syllable component 3 - NIC3 number of analyzed specimens - n temperature ºC - t