Abstract
Ring gland in adult Chrysomyia megacephala is composed of a dorsomedian globular compact gland, the corpus allatum over the aorta and an amalgamated component of corpus cardiacum and hypocerebral ganglion (gland-ganglion complex) below. The latter is innervated by oesophageal and recurrent nerves. The lateral portions of the ring do not expose cellular consistency. The corpus allatum is semisyncytial and contains discernible CAH- and AF-positive material. The difference in size and contour of the gland depends upon the maturity and age of the fly. The corpus cardiacum contains intrinsic cells and extrinsic fibres exhibiting secretion and storage respectively. Massive granule rich hypocerebral ganglion cells invade the corpus cardiacan elements. The immediate relation of these cells with the parenchymal elements of the corpus cardiacum is hitherto not established.
