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There are, however, some groups of insects, constituting what appear to be the remains of the ancient population of the equatorial parts of the Australian region, which are still almost entirely confined to it. Such are the interesting sub-family of Longicorn coleoptera Tmesisternitae; one of the best-marked genera of Buprestidae Cyphogastra; and the beautiful weevils forming the genus Eupholus.

In the following discussion of the subject I shall depart from the above order in so far as to set out with illusions of sense-perception. These are well ascertained, forming, indeed, the best-marked variety. And the explanation of these has been carried much further than that of the others.

Neither could move in any company, however eclectic, without evoking comment. They held in common that air of refinement and good breeding which is, or should be, the best-marked attribute of an aristocracy. It was impossible to imagine either in rags, but, given such a transformation, each would be notable because of the amazing difference that would exist between garb and mien.

The salivary glands act imperfectly; the mouth becomes dry, and is often opened and shut. I have also noticed that under slight fear there is a strong tendency to yawn. One of the best-marked symptoms is the trembling of all the muscles of the body; and this is often first seen in the lips.

From the foot of this tree they make excursions here and there for their store of winter food, acorns and the like, and they leave little paths on the hillside from tree to tree. The best-marked paths run to the places where there are the most acorns. A little later on there are more squirrels in the colony, the young of the parent pair, and other colonists from the valley.

O. Whipplei is related to O. arborescens, from which, however, it is easily distinguished by the latter having a stout central spine and numerous radiating ones. Of the 150 species of Opuntia known, about one-third have been selected for description here, and amongst these will be found all the best-marked kinds in the genus, and most of those of which we have any knowledge.