Abstract
THE retrocerebral endocrine organs of the third instar larvae of Calliphora erythrocephala Mg., Calliphora vomitoria Linn., Lucilia sericata Mg., Lucilia caesar Linn., and Protophormia terrae-novae R–D. have been examined, by direct dissection with methylene blue supravital staining and in serial sections, in order to elucidate a number of hitherto obscure points. Descriptions of these organs in C. erythrocephala are given by Thomson1 and by Possompes2 but disagree in some details. The latter's term ‘peritracheal glands’ for the large cell component of the ring of Weismann3 has been adopted here.
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