“…A number of organic phosphorus compounds have been isolated and identified from the haemolymph of several species of Lepidoptera by employing chromatographic, chemical and enzymic methods (Wyatt, Kropf & Carey, 1963). Levenbook (1953) studied the variation of phosphorus compounds during metamorphosis of the lCINI PUPAL HAEMOLYMPH 827 blow-fly Calliphora erythrocephala Meig, and concluded that, though no change occurred in the amounts of acid-soluble lipid or nucleic acid phosphorus, that of inorganic phosphorus increased rapidly during pupation, attaining the maximum about half-way in adult development, and then declined. The content of easily hydrolysable phosphorus was high at the beginning and the end of pupation and the lowest after about one-third of the pupal period.…”