Structure of the Proboscis in Blood-Sucking Diptera

Abstract

DR. S. K. SEN¹ has expressed the view that the food-canal of blood-sucking Diptera is not formed, as is generally supposed, by the apposition of the labrum-epipharynx afrid the hypopharynx, but that it is actually the lumen of the hypopharynx itself, a channel which has been regarded hitherto as the continuation of the salivary duct. From the studies I have made it appears to me that this view is quite incorrect. An adequate reply to Dr. Sen would occupy too much space in this journal, but I have fully explained my views in various papers in Parasitology (1926, 1928, 1929 and 1932) and I must ask those who are interested in the subject to refer to them.