The expansion of the wings is 1-1/8 inches. _All the wings are very pale greenish-grey._ The male has three distinct dark brownish bands near the base, an irregular broad suffused band near the middle, becoming obsolete before it reaches the dorsum, a dark patch at the apex, another patch on the termen below the apex and another near the tornus. The hind-wings are traversed by numerous, very fine, wavy blackish lines, becoming darker towards the dorsum. In the female there are three wavy reddish-brown bands on the costa of the fore-wings, becoming obsolete towards the dorsum, then a wavy yellowish line, followed by two rust-red patches. The hind-wings resemble those of the male. Both sexes have the veins dotted with black, and the cilia of all the wings are grey barred with black. {43}The perfect insect was found in a limestone valley at the foot of Mount Peel, where it was fairly common. CHLOROCLYSTIS NEREIS, Meyr. (_Pasiphila nereis_, Meyr., Trans. N. Z. Inst. xx. 51.) (Plate VI., fig. 11 [M].) This insect has occurred at Mount Arthur, Mount Hutt, and the Humboldt Range, Lake Wakatipu, at elevations from 2,500 to 4,000 feet. The expansion of the wings is nearly an inch. _All the wings are dusky grey with numerous black and dull white, wavy transverse lines_; there is often a somewhat paler area near the apex of the fore-wings, and the termen of the hind-wings is slightly scalloped; the cilia are dull white barred with dark greyish-black. The perfect insect appears in January and February. It generally frequents cliffs on mountain sides, resting with outspread wings on the dark rocky surfaces. In these situations it is extremely difficult to detect, and the protective value of its colouring is thus at once demonstrated. CHLOROCLYSTIS DRYAS, Meyr. (_Pasiphila dryas_, Meyr., Trans. N. Z. Inst. xxiii. 97.) (Plate VI., fig. 12 [M].) This species has occurred at Wellington. The expansion of the wings is 1 inch. _The fore-wings are dull rosy-brown, traversed by numerous obscure blackish transverse lines, somewhat concentrated towards the middle and forming an ill-defined central band_; the termen is slightly shaded with blackish, and the veins are marked with dotted lines. The hind-wings are grey, tinged with rosy-brown; there are numerous very faint blackish transverse lines and the veins are marked with blackish dots. The cilia of all the wings are dark grey. The termen of the hind-wings is rather irregular. The perfect insect appears in December and January, and is attracted by light. I once took a specimen in July, but this may have been due to an exceptionally mild winter. CHLOROCLYSTIS SPHRAGITIS, Meyr. (_Pasiphila sphragitis_, Meyr., Trans. N. Z. Inst. xx. 51.) (Plate VI., fig. 13 [M], 14 [F].) This extremely variable insect has occurred at Wellington in the North Island, and at Christchurch in the South Island.