The perfect insect appears in January. It frequents rather open spots in the forest, and flies in a very busy manner close to the ground amongst the numerous ferns and other plants, which are always abundant in such situations. It is consequently very inconspicuous and sometimes difficult to capture. Thus, no doubt, it is often overlooked, and perhaps is much commoner than at present appears probable. Genus 3.--CHLOROCLYSTIS, Hb. "Face with short cone of scales. Palpi rough-scaled. Antennæ in male shortly ciliated. Abdomen crested. Fore-wings with areole simple, vein 11 running into or anastomosing with 12. Hind-wings with vein 8 anastomosing with cell from near base to beyond middle." (Plate II., figs. 19 and 20.) "This genus is especially characteristic of New Zealand, and is also found in South Asia, a few stragglers occurring in Europe and elsewhere."--(Meyrick.) We have twelve species, several of which are very beautiful. CHLOROCLYSTIS PLINTHINA, Meyr. (_Pasiphila plinthina_, Meyr., Trans. N. Z. Inst. xx. 49.) (Plate VI., fig. 8.) This pretty species has occurred at Wellington. The expansion of the wings is about ½ inch. All the wings are traversed by numerous obscure, wavy, reddish-yellow lines; the fore-wings have a dark shading near the base, _a very large white blotch in the middle_, and a dark chocolate-brown patch near the apex. _The hind-wings have a large shaded white patch in the middle_, a blackish dot near the base, and a series of brownish crescentic marks on the termen; the cilia of all the wings are pale brown barred with brownish-black. The termen of the fore-wings is very oblique, of the hind-wings rather irregular. Many specimens of this insect are strongly tinged with green, and the shape and size of the white patches on the fore- and hind-wings are subject to slight variations. The perfect insect appears in November and December. It frequents brushwood, where it may be occasionally taken at rest on tree-trunks but more often dislodged from the foliage. It is not a very common species. CHLOROCLYSTIS BILINEOLATA, Walk. (_Eupithecia bilineolata_, Walk. 1246. _E. muscosata_, ib. 1246. _Scotosia humerata_, ib. 1362. _Eupithecia semialbata_, ib. 1708. _E. cidariaria_, Gn., Ent. Mo. Mag. v. 62. _Cidiaria aquosata_, Feld., pl. cxxxi. 33. _Helastia charybdis_, Butl., Cist. Ent. ii. 503. _H. calida_, ib. 504. _Pasiphila muscosata_, Meyr., Trans. N. Z. Inst. 50. _P. bilineolata_, ib.) (Plate VI., fig. 9 type, fig. 10 variety.) This beautiful little species is common, and generally distributed throughout the country.