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I will specify the few other cases in which I have heard of a difference in colour between the sexes of beetles. These two latter beetles belong to the family of Longicorns. Messrs. R. Trimen and Waterhouse, jun., inform me of two Lamellicorns, viz., a Peritrichia and Trichius, the male of the latter being more obscurely coloured than the female.
Perch, brightness of male, during breeding season. Peregrine falcon, new mate found by. Period of variability, relation of, to sexual selection. Periodicity, vital, Dr. Laycock on. Periods, lunar, followed by functions in man and animals. Periods of life, inheritance at corresponding. Perisoreus canadensis, young of. Peritrichia, difference of colour in the sexes of a species of. Periwinkle.
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