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Typhaeus, stridulating organs of; stridulation of. Twins, tendency to produce, hereditary. Twite, proportion of the sexes in. Ugliness, said to consist in an approach to the lower animals. Umbrella-bird. Umbrina, sounds produced by. United States, rate of increase in; influence of natural selection on the progress of; change undergone by Europeans in the. Upupa epops, sounds produced by the male.

The resplendent trogon the largest of the species is one of the handsomest of birds, on account of the richness and brilliancy of its colour, the beautiful blending of tints, the flowing grace of its plumage, and the elegance of its colour. On its forehead is a curiously-shaped tuft, of slight and elastic feathers which curl over something like those of the umbrella-bird.

Arthur and I were in the meantime engaged in trying to tame Master Toby and the umbrella-bird, which we called Niger. Both seemed tolerably reconciled to captivity. Ellen's little pet parrot, Poll, kept casting suspicious glances at its feathered companion, not satisfied with the appearance of the curious-headed stranger, while Nimble watched every movement of his cousin Toby.

We saw several species of trogons, and frequently caught sight of that curious black umbrella-bird which I have before described. Clumps of the light and exquisitely graceful assai palm shot up everywhere.

I was sorry that we could not have it taken alive to Ellen, and I tried to explain to Duppo that we wished to have living creatures if possible captured, like the umbrella-bird. We had been paddling on for some time beneath the thick overhanging boughs, almost in darkness, when a bright glow attracted our attention. "We must be near the camp," exclaimed Arthur, and we shouted out.

We saw also the curious black umbrella-bird; which is so called from having a hood like an umbrella spread over its head. Flocks of paroquets were seen, and bright blue chatterers; and now and then a lovely pompadour, having delicate white wings and claret-coloured plumage.

They subsist entirely on fish, turtle, and manatee. Several species of trogons are peculiar to this submerged region. The curious black umbrella-bird is entirely confined to it, as is also the little bristle-tailed manakin. Several monkeys visit it during the wet season, for the sake of its peculiar fruits; and here the scarlet-faced urikari has its home.

He brought with him his zarabatana or blow-pipe, his bow, and a quiver full of arrows, as also a basket of farinha, apparently supposing that we might be unable to provide him with food. Seeing the curious umbrella-bird secured to a perch projecting from the wall, I asked him to bring it, as I wanted to show it to Ellen.

Bates, H.W., on variation in the form of the head of Amazonian Indians; on the proportion of the sexes among Amazonian butterflies; on sexual differences in the wings of butterflies; on the field-cricket; on Pyrodes pulcherrimus; on the horns of Lamellicorn beetles; on the colours of Epicaliae, etc.; on the coloration of tropical butterflies; on the variability of Papilio Sesostris and Childrenae; on male and female butterflies inhabiting different stations; on mimicry; on the caterpillar of a Sphinx; on the vocal organs of the umbrella-bird; on the toucans; on Brackyurus calvus.