[Influence of environmental factors on the size of Musca domestica L. (Diptera: Muscidae)].

: The nature and the magnitude of variability in 13 wing morphological characters of Musca domestica and the influence of environmental factors that could contribute to the occurrence of these variations were studied. Size and sexual dimorphism accounted for most of the total variation (83.7%). Variability caused by shape, which has a large genetic background, represents only 6.5% of the total variability. Males are usually smaller than females and both vary in a similar way throughout the year. Larval rearing density explains 93% of size changes.