The “Boll Worm,” or “Maize Moth,” _Heliothis armigera_, is another cosmopolitan cut-worm which does a great deal of damage to cotton bolls and maize; is common in the pea crops, and also damages tomatoes. The moth measures about 1 inch across the wings; the fore pair are greyish yellow with purplish-brown tints, but are very variable in colouration; the hind wings are silvery grey with the apical portions dark brown; the latter pair are constant in their markings. The handsome little moths belonging to the Genus _Thalpochares_ are remarkable for their curious plump naked larvae, which feed upon different kinds of scale insects, at the same time covering themselves with a portable cocoon composed of fragments of the coccids matted together with silken strands. _Thalpochares coccophaga_ is a pretty creamy winged moth with the basal portion shaded with brown and reddish tints, and measures about ¾ of an inch across the wings. The larvae feed upon a number of different insects native to the bush, and have lately been of some economic value in destroying olive scale (_Lecanium oleae_) in the orchards. Several other species have been described with identical habits. _Earias fabia_ is a pest of the cotton plant; I have bred numbers obtained in the cotton bolls growing at the Hawkesbury College, N.S.W.; the larva is a slender dull green grub, which when full grown forms a stout, oval, light brown, felted cocoon attached to the dead foliage. The moth is slightly over one inch across the wings, which are of a uniform pale yellow colour, each with a greenish bar in the centre; the hind pair are lighter. In forming such a well-made cocoon this moth seems out of place in the Noctuids; and Lower says in his Catalogue, “that some writers refer this moth to the BOMBYCINA.” Westwood and Swinhoe place it in the TORTRICIDAE. The Genus _Hadena_ contains a number of Australian species rather more abundant in Tasmania than the mainland; it is another cosmopolitan group, found in Europe and America. _Hadena expulsa_, slightly over 1 inch across the wings, has the fore pair of a general grey tint, mottled with brown; the hind pair are darkest towards the apex and are fringed on the margin with fine white down. [Illustration: =Fig. 131.=--The Grey-Cutworm Moth. _Mamestra ewingii_ (Westw.).]