Abstract
The hydrocarbon composition of the willow leaf beetle Chrysomela vigintipunctata (Scopoli) (Coleoptera: Chrysomelidae) is presented in this paper. Surface and internal hydrocarbons, total hydrocarbons of fed and starved insects, of the excrement and of the diet have been examined and compared. Normal chain-, terminally branched monomethyl-, internally branched monomethyl-, dimethyl-, trimethyl alkanes and only four alkenes have been identified in the insect. The chain-lengths varied in the interval C 19 to C 43. Odd chain alkanes dominate. Surface hydrocarbons are characterised by the presence of longer-chain (C 38,C 39 and C 41) dimethyl- and trimethyl-alkanes. Dimethyl- and trimethyl alkanes with an unusually great number of methylene groups between the branch points have been detected. The excrement and the willow leaves have much simpler HC pattern: n-alkanes, terminally branched alkanes and alkenes. Based on the similarity between the HC pattern of the excrement and willow leaves it is assumed that the dietary HC are eliminated with the excrement.
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