Abstract
The longevities of inbred Drosophila melanogaster adult males and females and of the first and second generation hybrids derived from the inbred lines were measured at 25°C, a normal laboratory temperature, and at 30°C, a temperature close to the upper viable limit. The inbreds lived shorter than the hybrids but not more so at the higher of the two temperatures. The F 1 and F 2 hybrids have similar longevities and this justifies the use of F 2 hybrids when an experiment requires a large initial population of individuals with similar life expectancies. Variability in individual survival time within and between experiments is dominated by environmental factors which are difficult to control.
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