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Trichius, difference of colour in the sexes of a species of. Trigla. Trigonocephalus, noise made by tail of.
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.
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