Abstract
Femur cuticle from fifth instar larvae of the desert locust, Schistocerca gregaria, has been characterized with respect to composition, rate of deposition, and rate of sclerotization. The results are compared with those from adult cuticle of the same species. The protein compositions of the two types of cuticle are very similar, but the rates of deposition of both protein and chitin are different. The main difference is, however, that sclerotization is restricted to the first day after ecdysis in larval cuticle, whereas in adult cuticle sclerotization continues for at least a couple of weeks. The result is that the endocuticle remains untanned in the larvae, whereas in the adults the whole cuticle becomes tanned.
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