Abstract
A major component of the adult fleshfly, Sarcophaga bullata, cuticular lipid is hydrocarbon. There are on average about 100 μg. of hydrocarbon per fly; however, only about one-third of the hydrocarbon is extractable by hexane washing the flies just after the pupal-adult ecdysis. Seven days after adult emergence the cuticular hydrocarbons are nearly all extracted by hexane washing. Some high molecular weight hydrocarbons are absent in newly emerged adults but are clearly present in low, but measurable, amounts in older adults. The major hydrocarbons are n-alkanes and monomethylalkanes with minor amounts of other branched alkanes, monoenes, and alkadienes. Every possible odd-numbered monomethylalkane was identified through the use of mass fragmentation chromatography. Even-numbered monomethylalkanes are strikingly absent.
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