Fig. 4. Numbers of tactile hairs and basiconic sensilla on the hind femur of final-instar nymphs differed between phases. (A) Numbers of tactile hairs on the outward faces (viewed laterally) of the front, middle and hind legs. Solitarious locusts (black bars) had significantly more tactile hairs on the hind femur than did gregarious locusts (white bars). (B) These additional tactile hairs occurred on the dorsal distal and most ventral proximal regions of the anterior face of the hind femur. (C) On the distal anterior hind femur (black region of inset), solitarious locusts had significantly fewer basiconic sensilla but significantly more tactile hairs than did gregarious locusts. Significance (t-test) is indicated by asterisks: ^*, P<0.05; ^**, P<0.01; ^***, P<0.001; N=10 locusts per group throughout.