Abstract-The total hydrocarbons of the millipede Graphidostreptus tumu&porus contain 10 per cent saturated components. The composition of the saturated hydrocarbons from males, females, and eggs is reported.Straight-chain alkanes (n-C16-n-C38) constitute 59 to 75 per cent of the saturated hydrocarbons with a strong predominance of odd chain over even chain homologues. Several types of branched-chain alkanes are also present: 2-methyl (iso), 3-methyl (anteiso), and at least one other type of branching.In males and females the most abundant n-alkane is nonacosane (n-C&,) (21.67 and 32.10 per cent, respectively), whereas in eggs heptacosane (n-C,,) predominates (9.90 per cent). The composition of the n-alkanes in males and femaks resembles the values obtained for plant hydrocarbons, indicating that part of the saturated hydrocarbons is probably derived from the food. The fow content of n-Cl,, in the eggs (7.70 per cent) may indicate that the hydrocarbons of the ingested food are not deposited into the egg lipid in equal amounts.