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Show 346 MR. W. WARREN ON NEW GENERA AND [Apr. 18, LOBOGONIA AMBUSTA, sp. n. (Plate XXXI. fig. 21.) d . Fore wings pale yellowish ochreous, with a very few scattered fuscous strigae; 2 transverse, straight, olive-brown lines, at 4 and | respectively, each starting from a darker costal blotch; costa itself finely speckled with black; subterminal line indicated by a small blackish costal spot, another on the inner margin, and a third opposite the cell; an oblong brownish blotch almost touching the 2nd line in the middle, just beyond it; fringes more reddish, edged with black from apex to elbow, and with 2 black spots below it. Hind wings like fore wings, but with a single dark line just in the centre, and the fringes less touched with black. Head, thorax, and abdomen ochreous ; antennae the same, but much dusted with darker. Underside fulvous-ochreous, much irrorated with transverse grey strigae, which are massed into a blotch towards the base of the fore wings; both wings with distinct dark cell-spot, and central broad dark line ; inner margin of fore wings clear ochreous, quite without markings. Expanse of wings 30 millim. Hab. Khasia Hills. [Taken at light by m e at about 5000 feet in Sept.-H. J. E.~\ MYOSTOMA, gen. nov. Fore wings with costa nearly straight, slightly curved only at base and before apex; apex produced, blunt; hind margin subfalcate below apex, wdth an elbow in the middle; the anal angle rather square; hind wings rather narrow, pear-shaped; antennae $ simple, S faintly pubescent; forehead rounded, smooth; palpi very short indeed, hardly perceptible; tongue weak. Neuration :-Fore wing: 1st median nervule at §; 2nd and 3rd from the end of cell; lower radial from the centre of the transverse vein; upper from the upper angle of cell; 1st subcostal free; 2nd and 3rd out of 4th shortly before apex, 5th out of 4th at ^ from cell. Hind wings, $ : costal and subcostal nervures strongly convex towards each other, approaching, but not touching, about middle of cell; 1st subcostal nervule rising just before end of cell; discocellular bluntly angulated, radial from the angulation; 1st median nervule at f, 2nd and 3rd from a point at lower end of cell. Hind wings, d1 : with the costal and subcostal running more or less parallel to middle of cell; subcostal nervules from end of cell; discocellular angulated ; the lower end of cell produced and rounded; 1st median nervule at §, 2nd and 3rd near each other from the rounded extremity of cell; radial at the same distance just beyond the 3rd. Type, M. straminea. This difference in the neuration in the two sexes is repeated in the next genus, where the abnormality of neuration in the <$ is still more noticeable. In Myostoma the wings are longer and narrower in proportion in the S than in the $ . I have described |