deilinia] SELIDOSEMIDAE 279 



Though only including a few species, the genus ranges 

 throughout the Northern hemisphere, and one member is found 

 in Australia ; derived from near Euchlaena. 



Head wholly white . . . .1. pusaria. 



,, with ochreous and black frontal bar . 2 exanthemata. 



1. D. pusaria, L. {rotundaria, Hw.) 27-30 mm. Head 

 white. Forewings white, sprinkled with dark grey ; first, 

 median, and second lines straight, grey, first angulated or 

 obsolete near costa. Hindwings as forewings, but lines slightly 

 curved, first absent. 



Britain to the Hebrides, Ireland, very common ; N. and C. 

 Europe, WC. and N. Asia ; 5, 6. Larva pale green or brown ; 

 a dorsal sometimes incomplete series of purple-red marks (in 

 brown specimens darker brown), sometimes white-edged ; some- 

 times an interrupted reddish lateral line: on hazel, birch, etc.; 

 7-9. 



2. D. exanthemata, Sc. 27-29 mm. Head white, with an 

 ochreous frontal bar marked with black. Forewings ochreous- 

 whitish, strigulated with grey; lines greyish -ochreous, first 

 angulated near costa, median irregular, second curved. Hind- 

 wings as forewings, but first line absent. 



Britain to Ross, Ireland, common ; N. and C. Europe, WC. 

 and N. Asia; 5, 6. Larva pale green; on 5-12 sometimes 

 a dorsal series of purple-red marks, including black white-edged 

 spots ; subdorsal line yellowish ; a lateral series of purple- 

 red or red-brown marks ; incisions yellowish : on hazel, birch, 

 etc.; 7-9. 



19. OURAPTERYX, Lch. 



Face subpromincnt, with short projecting hairs. Tongue 

 developed. Antennae in <$ shortly and evenly ciliated. Palpi 

 rough-scaled. Thorax densely hairy beneath. Femora hairy ; 

 posterior tibiae in $ dilated. Forewings in <$ without fovea ; 

 10 absent, 11 anastomosing or connected with 12 and sometimes 

 9 also. 



A small Indo-Malayan genus, containing one European 

 species. 



1. 0. sambucaria, L. 42-54 mm. Head pale yellow, face 

 ferruginous. Forewings pale yellow, thinly strigulated with 

 pale grey ; first and second lines yellow-grey, nearly straight ; 

 a yellow -grey linear discal mark. Hindwings with ground as 

 in forewings; second line straight, yellow-grey, not reaching 

 margins ; termeu angulated and strongly caudate in middle, 



