Abstract
IT is well known from the work of Buchner1, Breitsprecher2, and others that mycetomes occur at the anterior end of the larval midgut of several species of Anobiid beetles. The mycetocytes are distended with micro-organisms which are of obscure taxonomy, but appear yeast-like, and of which the symbiotic role has been established by Koch's3 demonstration of their necessary presence in Sitodrepa panicea, if the larva is to grow normally. Blewett and Fraenkel4 have shown that the presence of the symbionts in Sitodrepa larvæ can offset a dietary deficiency of five vitamins of the B group: the symbionts in Lasioderma serricorne can apparently supply six of these vitamins to the larva.
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