SCHISTOSTEGE; LITHOSTEGE, By L. B. Prout. 171 



end. It was discovered in damp places in the forests of the Ural and has since been recorded from the 

 Altai and the Issyk-Kul district. — eversmannaria H.-Sch. has the band of the forewing widened and shows evers- 

 also a narrow, or even rather wide, white band on the iipperside of the hindwing, whereas in typical tihiale mannaria. 

 this latter is confined to the underside, and always quite narrow. Chiefly characteristic of more northerly 

 localities, but also occurring in the South as an aberration; Scandinavia (very scarce and local), Sajan, 

 Amurland (chiefly in the north), Japan etc. — ab. decisata Walk, is a slight modification of everfsmannaria, decisata. 

 the band of the forewing remaining rather narrow while that of the hindwing is also present. The locality 

 for Walker's type was unknown, but similar examples occur occasionally in Japan. — The egg is light green, 

 somewhat oval, flattened. The larva is somewhat narrowed anteriorly, somewhat flattened, with prominent 

 lateral folds; green with yellow incisions and broad brown-red dorsal line, in part interrupted, in part widened 

 into roundish or heart-shaped markings. It feeds on Actaea spicata in August, in damp places in woods. 

 The pupa is compact, brown, abdomen more yellowish, cremaster with two strongly divergent points; in an 

 earthen cocoon. The moth appears in June and July; it is very shy and flies high. 



17. Genus: Scliistostege Hbn. 



» 



Face rather prominent. Palpus moderate, rough-scaled. Antenna in cf ciliated. Foretibia without 

 apical hook. Hindtibia with all spurs present. Forewing with areole double. Hindwing with costal margin 

 very long, the wing being produced to a point at the end of the S""* subcostal vein; costal merely appressed 

 closely to subcostal, not anastomosing, but connected with it by a bar near the end of the cell; cf with 

 submedian vein wanting, the basal part of the inner-marginal area being folded so as to form a small pocket 

 beneath, much as in the following genera though less highly developed. 



Only two species are known, both Palearctic. Easily distinguished 'from the following genera by the 

 shape of the hindwing. 



S. decussata Schiff. (6d). White, more or less dusted with fuscous, all the veins fuscous; both wings decussata. 

 near the distal margin with a clearer white narrow band, bordered on each side with fuscous, strongly 

 outbent between the 2"'' radial and 2"'^ median; fringes chequered white and fuscous. Forewing beneath 

 more infuscated than above. Local in Southeast Europe, said to fly by day in damp meadows. — ab. 

 fortificata Tr. is a frequent form in Hungary and has entirely supplanted the type in the neighbourhood of fortificata 

 Buda-Pesth. It is more or less uniformly suifused with lighter brownish. The white part of the fringes, 

 however, and often the subterminal band also, remains free from the suffusion. — ab. infumata Th.-Mieg is infumata. 

 the extreme development of the fortificata form, the wings being darker smoky and absolutely unicolorous. — 

 The early stages have recently been described by Spitz, who found the larvae in May on a Euphorbia. Larva 

 grass-green, tapering anteriorly, skin transversely folded, a strong lateral ridge, tubercles brownish, ringed 

 with light yellow, setae fine; lateral stripe yellow;- venter with 3 fine, mostly light yellow stripes; head round, 

 smaller than prothorax, face slightly flattened. Pupa rather glossy brown, wings somewhat lighter; leg- and 

 tongue-case projecting; cremaster with 2 points. The moth appears after about 3 weeks. 



S. nubilaria Hb. (6 d). Paler than the preceding, the upper surface without the darkened veins and niiUlaria. 

 borders to the subterminal band, the band itself less strongly outbent in the middle; fringes less strongly 

 chequered. The ? is smaller and narrower-winged than the cf. — exalbata Hb. (6 d) is still paler, the upper exalhata. 

 surface being of an almost unicolorous dirty white, the subterminal band (at least on the forewing) faintly 

 indicated in purer white. Forms a local race about Sarepta, but occurs with the type in some other localities. — knupfferi. 

 kniipfferi Huene from Krasnoufimsk, E. Bussia, is said to be darker, more reddish grey than the type and with 

 the fringes more strongly chequered. — nubilaria inhabits Boumania, S. E. Russia and the mountains of Central 

 Asia as far as Mongolia. Flies on the steppes in June. 



18. Genus: I^ithoistege Hbn. 



Face with obtuse prominence. Palpus moderate, rough-scaled. Antenna in cf somewhat thickened 

 minutely ciliated. Forefemur much thickened; foretibia extraordinarily short, ending in a broad, horny plate, 

 from which project a long, strong inner claw, a very short outer one and usually a point in the middle. 

 Hindtibia with all spurs. Abdomen obtuse at extremity. Forewing with areole double. Hindwing narrow, 

 its apex rounded, much less produced than in ScMstostecje ; costal vein occasionally as in Schistostege, but 

 more commonly anastomosing either at a point near the end of ceil or more strongly, 3'''^ radial and P' median 



