抄録
The distinct differences in calling sounds of Nephotettix cincticeps, N. virescens, N. nigropictus and N. malayanus suggested sexual isolation of these sibling species. Male calling sounds were a composite sequence with various amplitude and sound frequencies, 2 or 3 types of sounds in each species. Female calling sounds were a buzz composed of regular chirps or pulses, showing different chirp (pulse) repetition rates among the species. No identical or confusingly similar sounds were demonstrated among the species. Females were capable of discriminating the calling sounds of conspecific males even if one type of male sound was played back.
