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Updated: May 19, 2025
Simiadae, their origin and divisions. Similarity, sexual. Singing of the Cicadae and Fulgoridae; of tree-frogs; of birds, object of the. Sirenia, nakedness of. Sirex juvencus. Siricidae, difference of the sexes in. Siskin, pairing with a canary. Sitana, throat-pouch of the males of. Size, relative, of the sexes of insects. Skin, dark colour of, a protection against heat.
On the other hand, in the Tenthredinidae the males are generally darker than the females. In the Siricidae the sexes frequently differ; thus the male of Sirex juvencus is banded with orange, whilst the female is dark purple; but it is difficult to say which sex is the more ornamented. In Tremex columbae the female is much brighter coloured than the male. I am informed by Mr.
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