"Face smooth. Palpi short, rough-haired beneath, porrected. Antennæ in male stout, serrate, shortly ciliated. Fore-wings with vein 6 from below 9, 7 from below angle of areole, 10 rising out of 9 above origin, anastomosing again shortly with 9, 11 anastomosing shortly with 10, 12 anastomosing shortly with 11. Hind-wings normal."--(Meyrick.) (Plate II., fig. 53, neuration of fore-wing of _Sestra humeraria_.) We have two species in New Zealand. It will be seen that my figure of the neuration of _Sestra humeraria_ does not precisely agree with Mr. Meyrick's description. The differences in the results arrived at are probably due to the variability in structure of veins 10, 11 (and 12), mentioned when dealing with the characters of the entire family. Similar slight discrepancies also occur in connection with the three following genera. SESTRA HUMERARIA, Walk. (_Macaria humeraria_, Walk. 940. _Lozogramma obtusaria_, ib. 985. _Cidaria obtruncata_, ib. 1421. _Sestra fusiplagiata_, ib. 1751. _Amastris encausta_, Meyr., Trans. N. Z. Inst. xvi. 105. _Sestra humeraria_, ib. xviii. 184.) (Plate X., figs. 1 and 2 varieties; Plate III., fig. 20, larva.) This species is very common, and generally distributed throughout both the North and the South Islands; it also occurs plentifully at Stewart Island. The expansion of the wings is 1-3/8 inches. _The fore-wings are pale plum-colour_; there is an indistinct, curved, brownish transverse line near the base; _a straight dark brown line across the middle, and a curved series of blackish dots beyond the middle_; the apex is pointed, and the termen has a strong projection a little above the middle. The hind-wings are ochreous, with a series of minute brownish dots across the middle. This is a variable species. The fore-wings are often much clouded with rich brown, and in some specimens scarcely a trace of the original purplish colour remains; the central straight transverse line is often absent, and the other lines are frequently very indistinct, except on the costa; the dots on the hind-wings are also often absent, and occasionally specimens are met with in which all the wings are almost white. The larva is rather elongate, dull yellowish-brown or greenish-brown; there is a very broad dark brown dorsal line, and several wavy lateral lines; the prolegs are black, the spiracles are also black; there is a slight hump on the posterior edge of each of the last six segments, the hump on the penultimate segment being considerably larger than the others. The length of the caterpillar when full grown is about 1 inch.