The expansion of the wings is from 1 to 1¼ inches. _All the wings vary from pale ochreous to rather dull yellowish brown, sometimes very slightly tinged with green. There is usually a large number of fine, slightly waved, oblique lines arranged on both pairs of wings, very like the markings in Venusia verriculata_ (see page 53), both insects evidently having acquired this style of colouring for similar protective purposes. In many specimens the whole of the anterior portion of the fore-wings, a small area at the base of the hind-wings, and a band near the termen are much paler in colour than the rest. There is usually a very oblique elongate pale area near the apex, and an irregular dark spot considerably below the apex. The outline of all the wings is more or less distinctly scalloped. The larva (according to Mr. Purdie[27]) is about 1 inch in length, greyish-brown, with a rough prominent dorsal tubercle about the ninth segment. There are sometimes other smaller tubercles. It feeds on various species of _Coprosoma_ in January, March, and May. The perfect insect appears from October till March, and generally frequents rather open country where Manuka and Cabbage Tree Palms are abundant. HYDRIOMENA PRIONOTA, Meyr. (_Arsinoe prionata_, Meyr., Trans. N. Z. Inst. xvi. 73. _Anachloris prionata_, Meyr., ib. xviii. 184.) (Plate VI., fig. 47.) This species has been taken in the South Island at Mount Arthur, Castle Hill and Dunedin. The expansion of the wings is rather under 1½ inches. The fore-wings are dull yellowish-brown, with many obscure, wavy, transverse, brown lines, which tend to form two ill-defined bands, one rather narrow near the base and the other much broader near the middle of the wing. _The hind-wings are very pale yellowish-brown_; there are a few obscure dark lines near the dorsum. _The veins are distinctly dotted in black, and the outline of all the wings is deeply scalloped._ The perfect insect appears in January, but is not common. HYDRIOMENA DELTOIDATA, Walk. (_Coremia deltoidata_, Walk. 1321. _Cidaria inclarata_, Walk. 1411. _Cidaria perductata_, Walk. 1412. _Cidaria congressata_, Walk. 1412. _Cidaria conversata_, Walk. 1413. _Cidaria descriptata_, Walk. 1414. _Cidaria bisignata_, Walk. 1415. _Cidaria aggregata_, Walk. 1415. _Cidaria congregata_, Walk. 1415. _Cidaria plagifurcata_, Walk. 1416. _Coremia pastinaria_, Gn., E. M. M. v. 64. _Cidaria inopiata_, Feld. cxxxii. 3. _Cidaria monoliata_, Feld. cxxxii. 8. _Cidaria perversata_, Feld. cxxxii. 14, 24. _Scotosia deltoidata_, Meyr., Trans. N. Z. Inst. xvi. 70. _Cephalissa deltoidata_, Meyr., Trans. N. Z. Inst. xviii. 184.) (Plate VII., figs. 1 to 9 varieties.) This pretty insect is extremely abundant throughout the country.