have never once succeeded; it seems to be entirely dependent on itself (possibly emotional), and not arising from any outward cause—nor from the time of day; neither is it regular in its changes. At first, I was a little astonished, and could scarcely believe my own eyes, until I had repeatedly proved the event; the change of colour is always equally the same, extending all over its body. This lizard is also infested with a tiny red parasite, that sticks on between its scales in the outer angles of the thighs of its hindlegs, where it lives together in little clusters of 12–16. This parasite has a thickish body, rather soft, and is very difficult to remove entire. I suppose it to be an insect of the Hemiptera order. I have sent specimens of it to Professor Hutton at Christchurch, and to Mr. Maskell at the Museum, Wellington, for examination, etc.

Art. XV.—A Description of some newly-discovered New Zealand Insects believed to be new to Science. By W. Colenso, F.L.S. [Read before the Wellington Philosophical Society, 1st October, 1884.] Insecta. Order Orthoptera Section Gressoria. Family Phaomidæ. Division Apterophasminæ. Genus Bacillus 1. Bacillus coloreus, sp. nov. Female; General colour light green; the two basal joints of antennæ (under-surface), the throat, and the upper long curved ends of anterior femora bright pink-red. Head oblong, rather narrow, 8–9 short scattered muricated points on vertex; occiput broad, width of prothorax; maxillary palpi finely pubescent; antennæ 12 lines long, very slender, cylindrical, pubescent, composed of 22 joints, articulations pink-red, the basal joint large broad and flattish and green on the upper surface, the second basal very small, the rest large, brownish-green with a pink tinge, increasing in size to apex. Body mostly smooth, 3 ½ inches long, stout, increasing in size to 3rd abdominal segment where it is 3 ½ lines wide, a narrow slightly-winged crease or fold with a light-yellow margin extending downwards from anterior legs, giving the appearance of double side margins to the abdomen, which is 19 lines long; a small triangular central dark-brown spot at occiput, another at lower end of pronotum, with a very narrow dark line