LITHOSID.^. 215 



aud Armenia ; and in the National Collection there is a speci- 

 men labelled " Northern India." 



3. L. helveola, Oclis. ; helvola, Riih. ; deplana, 

 Staucl. Cat. — Expanse, 1^ to If inch. Fore wings narrow, 

 dull yellow-grey or brownish-yellow, spotless ; hind wings 

 paler yellowish, often with a greyer border. 



Antennae slender and threadlike, but in the male fringed 

 with tufts of bristles, rather long and curved, especially the 

 central one, arising from swellings or knots on the joints ; 

 brown. Head yellow ; thorax ochreous in front, pale buff or 

 pale grey behind ; abdomen yellowish-grey. Fore wings of 

 the male rather long, of somewhat even width, channelled 

 with longitudinal wrinkles and covered with raised scales 

 which give them a rough powdered appearance ; costa nearly 

 straight, but curved a little before the apex, which is some- 

 what squared ; hind margin very slightly curved and hardly 

 oblique ; dorsal margin gracefully curved, slightly hollowed 

 before the anal angle, which is blunt ; dull greyish-yellow 

 or yellowish-buff with an indistinct ochreous strijje along the 

 extreme edge of the costa, but broader near the base ; apex 

 and hind margin tinged with ochreous ; cilia glossy yellow. 

 Hind wings very broad and ample, the apex extending beyond 

 the anal angle of the fore wings, but rounded off shorter 

 behind ; very pale buff or brownish-yellow, shading into 

 brownish-grey at the margins ; cilia yellowish. Female rather 

 stouter, with simple antennee; fore wings broader; surface 

 smooth ; the costa decidedly more rounded, and the ochreous 

 costal stripe much more distinct ; general colour more slate- 

 grey with a softening of yellowish ; hind wings yellow-grey, 

 hardly greyer at the margins ; cilia paler. Or wholly dark grey, 

 except a broad ochreous costal stripe to the fore wings. Under- 

 side of the fore wings yellow-grey, more yellow at the margins, 

 and with the costal margin broadly ochreous ; hind wings very 

 pale greyish-yellow ; body ochreous ; legs yellowish. 



Not very variable, but the greyish border of the hind 



