Abstract
The total lipid content of the fat-body reached a maximum of about 4.5 mg. per insect in mature larvae and only changed slightly through the pharate pupal stage. The lipid content of the haemolymph (about 0.5 mg. per insect) also remained fairly constant at the onset of metamorphosis. During this period triglycerides formed about 90 per cent of the neutral fatbody lipids with 1,2-diglycerides and sterols comprising the other 10 per cent. In contrast, 1,2-diglycerides and sterols made up about 65 per cent of the haemolymph neutral lipids. Triglycerides, free fatty acids, sterol esters, and hydrocarbons were only minor components. The significance of these analytical results and the function of some of the lipid components are discussed.
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