HYDRIOMENA] HYDRIOMENIDAE 219 



a pale ochreous stria, posterior edge prominent beneath costa 

 and angulated in middle ; sometimes a darker discal spot ; sub- 

 terminal line whitish ; a blackish -fuscous interrupted apical 

 streak. Hindwings grey ; a darker discal dot ; a faint pale 

 angulated postmedian fascia. 



Britain to the Clyde, E. Ireland, not uncommon but over- 

 looked ; C. Europe ; 6, 7. Larva pale grey or greyish-ochreous ; 

 dorsal and subdorsal lines blackish, interrupted ; lateral brown ; 

 spiracular brownish, pale below ; subspiracular double, brown ; 

 head pale ochreous, brown-marked : on Bartsia odontites ; 9, 10. 



31. H. alchemillata, L. 17-20 mm. Fore wings fuscous or 

 ochreous-brown, with indistinct darker striae ; edge of basal 

 patch and two striae before median band obscurely whitish, on 

 dorsum clear white ; posterior edge of median band obtusely 

 angulated beneath costa, with short double median projection, 

 followed by two strong white striae ; an obscure discal dot ; 

 subterminal line obscurely whitish, on costa white. Hindwings 

 grey ; a darker discal dot ; a faint pale postmedian fascia. 



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

 Europe, WC. and N. Asia ; 6, 7. Larva rather stout, purplish ; 

 dorsal line broad, pale yellow ; subdorsal and spiracular narrow, 

 pale yellow ; head and plate of 2 black : on flowers and seeds 

 of Galeopsis ; 8, 9. 



32. H. affinitata, Stph. 22-25 mm. Fore wings ochreous- 

 f uscous. with darker striae ; a hardly paler stria before median 

 band, on dorsum white ; posterior edge of median band indented 

 above and below middle to form a usually double short median 

 projection, followed by two strong white striae, second some- 

 times pale ochreous ; a dark fuscous discal dot ; subterminal 

 line obscurely whitish, on costa white. Hindwings light 

 fuscous ; a darker discal dot ; a distinct whitish postmedian 

 fascia. 



Britain to Ross, common ; N. and NC. Europe ; 6. Larva 

 rather stout, pale pinkish-ochreous ; dorsal and subdorsal lines 

 darker, interrupted ; lateral pinkish ; head and plate of 2 

 black or blackish-brown : on seeds of Lychnis diurna ; 8. 



33. H. decolorata, Hb. 22-25 mm. Forewings pale ochreous, 

 with ochreous-f uscous striae ; edge of basal patch followed by a 

 thick white stria ; median band margined by white fasciae, 

 posterior interrupted by a double median projection of the 

 band ; subterminal line obscurely whitish, on costa white. 

 Hindwings whitish ; a grey postmedian stria ; a terminal pale 

 ochreous band. 



