Fig. 10. Projections of two right tripod arm tips (P and either V or Q) on the axis of abduction–adduction in Melolontha hippocastani (A) and Prionus coriarius (B). Abscissa shows turn of elytra, in degrees, while the ordinate shows values in mm, positive upwards. HP, HQ, HV, location of projections relative to the center of rotation. Small scatter about zero for the arm P confirms proper reconstruction of flat rotation of this arm; trends in arms Q or V indicate additional supination.