. LITHOSID.^. 217 



Germany, and other parts of Central Europe; in South 

 Sweden. North Italy, Livonia, Southern Russia, and some 

 parts of Asia. Specimens from Japan exist in the National 

 Collection under the varietal names pavescens and IcBvis. 



4. li. pygmseola, Z>&W.— Expanse i to U inch. Fore 

 wings very narrow, pointed, silvery yellowish-white; hind 

 wings yellowish, shaded with grey. 



Antenna threadlike; very slightly fringed in the male 

 with minute bristles ; yellowish- white. Head and thorax 

 bright yellow or yellowish-white; abdomen dark brown, 

 thinly dusted with whitish scales ; anal tuft pale yellow. 

 Fore wings very narrow, with a deep longitudinal crease or 

 wrinkle ; costa very slightly curved ; apex almost acute ; hind 

 margin slightly rounded and rather oblique ; dorsal margin 

 curved from the base, then neariy straight ; shining yellowish- 

 white or greyish-white, but in the latter case having the 

 margins whiter. Hind wings broad and rather short, rounded, 

 but slightly emarginate before the apex; pale yellow or 

 yellowish-white, broadly clouded with dark grey along the 

 costal region and to near the middle of the wing, where it 

 gradually shades off; cilia all yellowish- white. Female 

 smaller and stouter, with the hind wings rather more clouded 

 with grey ; otherwise similar. Underside of fore wings dark 

 grey, with the outer half of the costa, the apex, and the 

 hind margin sharply edged with bright pale yellow; 

 hind wings dark grey in the costal half, shading gradually 

 and regulariy off to yellow in the middle ; remainder pale 

 yellow ; cilia bright yellow ; body grey ; legs grey, tinged 

 with pale yellow. 



Very rarely variable in the shade of colour of the fore 

 wings, which occasionally become of a shining yellow. Mr. S. 

 Stevens has one of a pure silvery-white ; Mr. S. Webb one 

 entirely of a dark smoky-grey, approaching to slate colour ; 

 and, in Mr. F. Bond's collection, one entirely grey. Staudinger 

 included this species as a variety of L. liUarella, a species 



