The expansion of the wings is about 1-3/8 inches. The fore-wings are blackish-brown, darker towards the apex and termen; _there is an obscure rust-red wavy band near the base, and another at three-fourths, considerably bowed towards the termen at the middle_; there are also numerous wavy darker lines. The hind-wings are dull grey, and the termen is slightly scalloped. This species may be distinguished from any of the varieties of _H. deltoidata_ by its _narrower wings, and the absence of any distinct central band on the fore-wings_. The perfect insect appears in January. It is a scarce species. HYDRIOMENA SUBOCHRARIA, Dbld. (_Aspilates (?) subochraria_, Dbld., Dieff. N. Z. ii. 285. _Camptogramma subochraria_, Butl., Cat., pl. iii. 16. _Camptogramma strangulata_, Gn. x. 423. _Camptogramma fuscinata_, Gn., E. M. M. v. 92. _Arsinoe subochraria_, Meyr., Trans. N. Z. Inst. xvi. 73. Anachloris subochraria, Meyr., ib. xviii. 184.) (Plate VI., figs. 45 and 46 varieties.) This species is fairly common and generally distributed throughout the country. The expansion of the wings is about 1¼ inches. _The fore-wings are bright ochreous-yellow_; there is a brown dot a little above the middle, _and a dark brown transverse band at about three-fourths; the termen is shaded with dark brown_. The hind-wings are ochreous, with an obscure central transverse line. A variety (_Hydriomena fuscinata_, Gn.) often occurs in which the whole of the wings are more or less tinged with purplish-brown (Plate VI., fig. 46). The perfect insect appears from November till April. It chiefly frequents tussock country and swampy situations. In the Wellington district it is extremely abundant in {49}the clearings at the foot of the Tararua Range. According to Mr. Meyrick the typical form is common in Tasmania and Victoria. HYDRIOMENA TRIPHRAGMA, Meyr. (_Cidaria triphragma_, Meyr., Trans. N. Z. Inst. xvi. 74.) "_Male._--26-27 mm. (about 1 inch). Fore-wings moderate, termen strongly sinuate; pale dull greyish-purple; a very small darker basal patch, outer edge strongly convex, margined by a dark fuscous fascia, posteriorly whitish-edged; a dark fuscous fascia before one-third, irregularly outwards-curved, posteriorly suffused, anteriorly sharply defined and whitish-edged; a minute blackish discal dot; a dark fuscous fascia beyond middle, forming a strong angle in middle, upper and lower halves both inwards-curved, anteriorly suffused, posteriorly sharply defined and whitish-edged. Hind-wings moderate, termen somewhat irregular, projecting in middle; whitish-ochreous mixed with pale purplish; an angulated darker band before middle. "A very distinct species, probably not variable. "Blenheim; two specimens received by Mr. Fereday from Mr. Skellon."--(Meyrick).