Sounds of two species of band-winged grasshoppers (Orthoptera: Acrididae: Oedipodinae) from southern Kazakhstan

Songs of Sphingonotus savignyi andHelioscirtus moseri from southern Kazakhstan are described and illustrated by oscillograms and sonograms.In both species, calling song consists of sounds produced by wings during fl ight display and syllables produced by stridulation immediately after landing.In addition, the male S. savignyi, when on the ground, both alone and in the presence of a female, produces a song of different type using stridulation.S. savignyi songs include noise and pure-tone syllables; the latter have a regular sine carrier, which is visible on oscillograms at high speed.In one of the studied localities in southern Kazakhstan, S. savignyi, H. moseri, and S. obscuratus latissimus were strictly sympatric.Still, wing crepitation in these species differ either in the syllable repetition period or in the general scheme of the temporal pattern (prolonged single echeme or the sequence of short echemes).Apparently, such differences ensure reliable segregation of acoustic communication channels in these species. . Sphingonotus savignyi Helioscirtus moseri . , , , . , S. savignyi, , , . S. savignyi ; , - . S. savignyi, H. moseri S. obscuratus latissimus .