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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.
She must survey her territory like an oil-digger and calculate where she is likely to strike oil, which in her case is the burrow of her host Tremex. There is a vast series of facts in natural history like this that are of little interest until we understand them. They are like the outside of a book which may attract us, but which can mean little to us until we have opened and perused its pages.
Tragops dispar, sexual difference in the colour of. Training, effect of, on the mental difference between the sexes of man. Transfer of male characters to female birds. Transmission, equal, of ornamental characters, to both sexes in mammals. Traps, avoidance of, by animals; use of. Treachery, to comrades, avoidance of, by savages. Tremex columbae. Tribes, extinct; extinction of.
To enjoy understandingly, that, I fancy, is the great thing to be desired. When I see the large ichneumon-fly, Thalessa, making a loop over her back with her long ovipositor and drilling a hole in the trunk of a tree, I do not fully appreciate the spectacle till I know she is feeling for the burrow of a tree-borer, Tremex, upon the larvae of which her own young feed.
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