A considerable amount of anatomical information is available on the ovary of Oxcopeltzis. The gross anatomy and histology of this organ has been studied by Bonhag and Wick ('53) and a detailed account of the postembryonic development of the ovary has been published by Wick and Bonhag ('55). Because the ovarian tissues have proved to be especially amenable to histological processing, the milkweed bug has been selected as the subject of a detailed histochemical study. This is the second paper by the author dealing with the problem of yolk formatioii in Ouzcopeltus; in the first paper ( Eonhag, ' 5 5 ) , certain cytological aspects of the nurse tissues and oocytes mere investigated and the nucleic acids and carbohydrates (including protein-carbohydrate complexes) were R tudied histochemically.The purpose of the paper at hand is to shed some light on the nature and origin of the lipid substances found in the oocytes. This study should be considered as merely an exploratory one in an entomological field that has been hardly touched by modern methods of investigation.
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