Fig. 4. Utilisation plots for protein growth across the entire fifth stadium versus total protein intake (A) and for lipid growth versus total digestible carbohydrate intake (B). Circles are for solitarious locusts and squares are for gregarious insects. Values are means ± S.E.M. (N=7–20). The points from left to right along each curve in the protein utilisation plot are for foods 7:35, 14:28, 21:21, 28:14 and 35:7; for the lipid utilisation plot, the order is 35:7, 28:14, 21:21, 14:28 and 7:35 (see Materials and methods). Triangular symbols indicate the points achieved by insects provided with a choice of complementary foods and, thus, able to reach their intake target. Triangles are for solitarious insects and inverted triangles for gregarious locusts.