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In Diptera, as in other insects various life processes are regulated by an inte grated endocrine system. A special endocrine organ which encompasses the source of all the three metamorphosis hormones has been evolved in this order and was first described by Weismann (1864) in Calliphora vomitoria. The endocrine character of this composite gland has been suggested initially by Hadorn (1937) and established its functional status by Fraenkel (1935). Since then a host of workers (B. Scharrer and Hadorn 1938, E. Thomsen 1941, 1947, Vogt 1941, Pos sompes 1953 and M. Thomsen 1951 etc.) have concentrated their attention to the structure, nature and function of the Dipteran ring gland in order to ascertain the endocrine nature of the former both morphologically and experimentally. How ever, knowledge of the morphology, structure, nature of the endocrine organs and their anatomical relationship with the stomatogastric nervous system in Diptera of higher groups is far from complete. Because such knowledge is essential for physiological investigations, a morphological and histological study of the ring gland is undertaken in the adult Chrysomyia megacephala.

cytologia

Cytomorphology of the Ring Gland and its Relation with the Stomatogastric Nervous System in Adult Fly, &lt;i&gt;Chrysomyia megacephala&lt;/i&gt; (Diptera: Calliphoridae)