Fig. 2. Resting posture and responses to tactile stimulation of the abdomen. (A) Histograms of the different postures adopted by nymphs, by adult males and by adult females. (B) The responses of the same three groups of insects to an initial touch to the abdomen. (C) The responses to the same stimulus delivered 5 s after the preceding response had stopped. (D) Choice trees of the responses to touch; data as in B and C. The five choices made by adults are shown but, because nymphs cannot fly, they can make only four choices. The thickness of a line represents the frequency with which that choice was made. Forty adult males, 28 adult females and 56 nymphs were used.