Figure 3.

Effect of graded doses of [His⁷] corazonin injected, in peanut oil, on the pigmentation of albino locusts in L. migratoria. Albino locusts were injected at the beginning of the fourth instar, and their body color was checked 4 days later in the same (fourth) instar according to the color grades previously published (13); 0, unpigmented; 1–3, increasingly darker coloration; 4, practically black. Columns indicate means (n = 9–15 for each column).