Abstract
The melanic forms griseovariegata and grisea of the moth Panolis flammea are controlled by a biallelic autosomal gene, showing incomplete dominance, the typical and grisea forms being the homozygotes, and griseovariegata the heterozygote. The frequency of the grisea allele was between 0·1 and 0·2 in each of four populations sampled. Females of the three forms rest preferentially on different parts of the foodplant, Pinus sylvestris: typical moths on the trunks; griseovariegata on twigs; and grisea on needles. It is suggested that the frequency of the alleles could be affected by the number of potential resting sites of different types.
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