(_Hyperaucha octias_, Meyr., Trans. Ent. Soc. Lond., 1897, 383.) (Plate VI., fig. 7.) This interesting little species has recently occurred in some numbers in the neighbourhood of Wellington. I have no record at present of its capture in any other New Zealand locality. The expansion of the wings is about 1 inch. The fore-wings have the costa straight, and the termen with a large projection slightly above the middle; the colour is pale brown; _there is a broad dark brown patch on the costa at the base_, a jagged transverse line at about one-fourth, _a very broad, oblique, blackish-brown, oblong patch on the costa at about one-third; beyond this patch is situated the reniform which is very large, indented towards the termen where it is outlined in dark brown_; there is a very fine jagged transverse line from beneath the reniform to the dorsum; _a large irregular patch of dark brownish-black just before the apex_, and an obscure transverse line; there is a series of minute, dark brown, crescentic marks on the termen. The hind-wings are dull whitish-grey; there is a faint blackish dot in the middle, a wavy line a little below the middle, and a terminal series of small dark marks. The antennæ are filiform in both sexes. The perfect insect appears in October, November and December. It frequents dense forest ravines, and is generally disturbed from amongst dead leaves or old fern fronds. It is usually a very scarce species, but appears to be much commoner in some years than in others. According to Mr. Meyrick, it is also found in Australia. This species is placed by Mr. Meyrick in the genus _Rhapsa_. The simple antennæ and absence of the broad costal fold in the males would appear, however, to remove it from that genus, as restricted by him in the 'Transactions' of the New Zealand Institute, xix. 38. In all other respects it appears to conform to the genus.[25] {38}II.--THE NOTODONTINA. The _Notodontina_ are characterized as follows:-- "The maxillary palpi are obsolete. Fore-wings with vein 1b usually furcate, but with lower fork often weak or tending to be obsolete, 5 rising not nearer to 4 than to 6, parallel, 7 and 8 out of 9. Hind-wings almost always with frenulum, 1c absent. (Plate II., figs. 19 to 64, and Plate I., figs. 12 and 13.) "Imago with fore-wings more or less broad-triangular; hind-wings broad-ovate."--(Meyrick.) Larva (in New Zealand) generally with 10 or 12 legs only (Plate III., figs. 12, 17, 18, 19, 20, 21, 22, and 24), rarely with 16 (_Sphinx_, Pl. III., figs. 13 and 14). "Pupa with segments 9 to 11 free; not protruded from cocoon in emergence."--(Meyrick.)