Histology of the alimentary canal of the mature larva ofProdenia lituraFabr. (Lepidoptera)

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Abstract
The histology of the alimentary canal of the mature larva of Prodenia litura Fabr. is described in detail. The status of the oesophageal and stomodaeal valves, structure and morphological relationship of the mesenteric cells and the structure and formation of the peritrophic membrane are discussed. The oesophageal epithelium is deeply compressed by the intruding muscules and the chitinous intima bears prominent spines thus forming a valve. The structure and function of this valve is quite different from that of the stomodaeal valve. The interstitial cells give rise to two different forms of mesenteric cells, viz. the columnar and goblet cells. There are clusters of unspecified cells at the anterior end of the mesenteron. The role of these cells appears to be secreting chitin which helps in forming the peritrophic membrane.