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1. The males of many Drosophila species perform wing displays during courtship and there is evidence that the stimuli provided by these is primarily acoustic. 2. The songs produced by members of the melanogaster and obscura species groups were recorded and analysed. 3. The songs consisted of regularly repeated pulses of sound. The frequency within the pulses and the interval between them varied between species but was constant and characteristic for each species. 4. It is suggested that the songs are codes which allow females to recognise con-specific mates.