The larva is rather attenuated and black in colour; the dorsal line is narrow and bright yellow; the subdorsal is broader and white; and the lateral line is pale brown. The head, legs, prolegs, and under surface are pale brown, speckled with black; the spiracles are pink; a conspicuous white spot is situated above the spiracles.
This caterpillar feeds on the Tauhinu (Pomaderris ericifolia) in December and January. It is very active in its habits, and immediately drops to the ground when disturbed. It is much infested by a dipterous parasite. The pupa state is spent in the earth and lasts about six weeks.
The moth appears in February, March, and April. It is attracted by light, and in consequence often enters houses.
MELANCHRA OMICRON, n. sp.
(Plate [V]., fig. 42.)
This species was discovered at Wellington by Mr. A. Norris.
The expansion of the wings is about 1½ inches. The fore-wings are pale olive-green, mottled and striped with dull grey; there is a double transverse line near the base, another at about one-fourth, and another at about one-half, passing between the orbicular and the reniform; beyond this there are two indistinct shaded lines, and a terminal series of black marks; the orbicular is large, almost circular, and sharply outlined in black; the claviform is small and indistinct, and the reniform ill-defined, obscurely outlined in black towards the base. The hind-wings are brownish-grey, darker towards the termen.
The perfect insect appears in November.
MELANCHRA COMPOSITA, Gn.
(Cloantha composita, Gn., Noct. vi. 114. Auchmis composita, Walk., Noct. 616; Butl., Voy. Ereb., pl. ix. 12. Mamestra maori, Feld., Reis. Nov., pl. cix. 24. Leucania dentigera, Butl. Mamestra composita, Meyr., Trans. N. Z. Inst. xix. 22.)