Figure 5.

Photographs showing the effect of [His⁷] corazonin injected in peanut oil on the body color in L. migratoria (A–D) and S. gregaria (E–H). Locusts were injected with the hormone in 4 μl of oil or with 4 μl of oil alone at day 3 of the third instar and photographed 2 days after the subsequent ecdysis. Hormone (0.1 nmol and 1 nmol) was injected into L. migratoria and S. gregaria, respectively. (A) Oil-injected crowded albino nymph. (B) Untreated crowded normal nymph. (C) Hormone-injected crowded albino nymph. (D) Hormone-injected isolated albino nymph. (E) Oil-injected isolated nymph. (F) Untreated crowded nymph. (G) Nymph transferred from isolation to crowding at the third instar. (H) Hormone-injected isolated nymph.