Abstract
1. The cuticles of Thelyphonus, Rhipicephalus, Argiope, Galeodes and Carcinoscorpius have been studied. There is a nonchitinous, lipoprotein epicuticle and a chitin-protein complex procuticle. 2. There is evidence of phenolic tanning in Thelyphonus, Rhipicephalus, Argiope and also the tip of the chelicera in Galeodes. 3. There is a portion of the lamellated layer prepared for tanning but is not hardened: the mesocuticle. The possible causes for the formation of mesocuticle are discussed. 4. Sulphur occurs in the cuticles of Rhipicephalus, Argiope, Galeodes, and Carcinoscorpius. In the latter two, available evidence indicates the occurrence of sulphur bonds. The significance of the occurrence of sulphur is discussed.
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