FIGURE 4 in Contributions to the study of the grasshopper (Orthoptera: Acrididae Gomphocerinae) courtship songs from Kazakhstan and adjacent territories

FIGURE 4. Oscillograms and frequency spectrum of the courtship songs of two males (A, B) of Omocestus petraeus from Orenburg region. Song recordings are presented at three different speeds (faster oscillograms of the indicated parts of the songs shown in C–F). In all oscillograms the two upper lines are recordings of hind leg movements and the lower line is the sound recording. Different elements of the courtship song are indicated by numbers 1–3. Frequency spectrum (G) shown for element 2.