The influence of continuous contact on larval colour in the larger pellucid hawk moth, Cephonodes hylas L. (Lepidoptera: Sphingidae)
Applied Entomology and Zoology 8(3): 198
In further studies in Japan on the factors influencing larval coloration in Cephonodes hylas (L.), larvae were confined singly in such a way that the body surface was continually in contact with plastic strips and they could move only forwards and backwards. Leaves of cape jasmine [Gardenia jasminoides] were provided as food. All larvae that survived to the fourth or fifth instar were dark in colour, and it is suggested that the darkening obtained when rearing is carried out under crowded conditions [cf. loc. cit.] is a result of continual contact between the larvae.