Abstract
The cuticles of Tenebrio molitor contain a high percentage of apolar amino-acids and lack cystine and methionine. Larval and pupal cuticles from the pronotum and dorsal and ventral abdomen were indistinguishable. Adult cuticles from the pronotum and ventral abdomen were also similar but differed from the cuticles of the adult dorsal abdomen by having a higher percentage of apolar amino-acids. Glycine was the predominant adult cuticular amino-acid, alanine was the major larval and pupal constituent. Cuticles from second pupae produced by animals treated with juvenile hormone were indistinguishable from normal pupal cuticles, but there were differences between these cuticles and the pupal-like cuticles from animals which had been treated with actinomycin D. We have tried to correlate these data with the structure of the cuticles, and with the action of juvenile hormone and its mimics.
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