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 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.