Fig. 4. The density of each of the three hair types on the principal veins of the dorsal surface of the forewings in male and female locusts. (A) Basiconic sensilla occurred on all of the veins but were most numerous on the subcosta. (B) Medium length hairs occurred primarily on the subcosta. (C) Long hairs were restricted to the postcubitus and wing tip. Values are means ± S.D., N=5 animals. There were no differences in the densities of basiconic sensilla on male and female forewings (A), but females had significantly more medium hairs on the subcosta than did males (B), and more long hairs on the postcubitus than did males (C). Filled squares, males; open squares, females.