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This paper describes patterns of allozyme variation in the butterfly, Maniolajurtina (L.). Twelve loci, of which four were polymorphic (PGM, PGI, IDH-1 andIDH-2), were screened across 14 populations in south-east England. The patternsdescribed are not in agreement with expectation for a sedentary butterfly inwhich alleles are neutral to selection, for geographically distant populationsdiffered very little in gene frequencies. Geographic homogeneity is compatiblewith either a higher degree of vagility than expected for this species orsimilar selection pressures maintaining allele frequencies across the areasampled. Associations between patterns of variation at two loci and behavioural,morphological and environmental variables suggested that selection may be actingupon them. In particular, the genotype at the locus for PGM affected the lengthof time for which individual butterflies could fly continuously, while PGMallozyme frequencies varied according to the altitude of the site. The frequencyof allozymes at IDH-2 was correlated with the mean size of individuals in bothsexes when comparing sites. Possible causes of these associations are discussed.I conclude that patterns of variation in the loci studied are probably not goodestimators of population structuring, but are more likely to be the result ofselection

Allozyme variation in the butterfly, Maniola jurtina (Lepidoptera: Satyrinae) (L.): evidence for selection