392 LEPIDOPTERA. 



3. li. osteodactylus, ZiU. — Expanse \ to \ inch (15-20 

 mm.). Fore wings narrow throughout ; pale sulphur-yellow 

 with a minute dark dot before the fissure. Hind wings 

 shining whitish drab, with darker cilia. 



Antennae of the male short, simple, yellowish-white ; palj)i 

 very slender, almost threadlike, similar in colour; head and 

 thorax pale sulphur-yellow ; abdomen yellowish-white. Fore 

 wings slender with a slightly drooping tip ; costa arched 

 beyond the middle ; apex of each lobe pointed, the anterior 

 longer and curved over; dorsal margin not hollowed ; colour 

 smooth shining pale sulphur-yellow without markings except 

 a very minute dark dot at the base of the fissure ; cilia glossy 

 pale grey-brown. Hind wings rather short, divided, the 

 lobes narrow but glossy, pale golden-grey, the cilia more 

 smoky in shade but equally glossy. Legs extremely slender, 

 sulphur colour. Female similar. 



Underside of the fore wings smoky yellow, sulphur colour 

 along the costa ; hind wings shining pale smoky grey. 



On the wing in July and the beginning of August. 



Larva whity-brown with a greenish tinge and thickly 

 sprinkled with minute black dots ; dorsal stripe and sub- 

 dorsal line pale rosy pink ; raised dots inconspicuous, from 

 those on the dorsal area a single pale brown hair of moderate 

 length arises, those on the third to fifth segments curve 

 forward, those on the posterior segments curve backward ; 

 along the lateral area there is one dot with a moderately long 

 hair, on each segment; spiracles black ; prolegs pale brown. 



September and October, then hybernating full grown in a 

 case in the seed-head and spinning up in April ; on Solidago 

 virgaurca (golden-rod), feeding on the flowers and seed-heads. 



Pupa apparently undescribed. 



The moth hides, like its congeners, in the daytime among 

 its food-plant, and may be disturbed therefrom late in the 

 afternoon ; it flies naturally rather late at dusk and in the 



