766 TIN ETNA [ARGYKESTHIA 



Britain to Caledonian Canal, N. Ireland, common, more local 

 southwards; N. and C. Europe; 6, 7. Larva dull whitish- 

 yellow ; head and plate of 2 pale brown : in berries of Pyrm 

 aitcuparia; 8. 



Aerariella, Stt., is an almost unicolorous dark bronzy-fuscous 

 form, locally common (with the type) from Cheshire to York ; 

 the larva feeds in the same way ; it is probably only a local 

 form, but tending to become distinct. 



18. A. spiniella, Z. 10-13 mm. Head white. Forewings 

 rather dark purplish - f uscous ; costa strigulated with white; a 

 thick white dorsal streak to tornus, interrupted by a median 

 spot of ground-colour; two whitish costal spots before apex. 

 Hindwings grey. 



Britain to Stirling, E. Ireland, rather local ; C. Europe ; 8. 

 Larva greenish-grey : dorsal line faintly rosy; head dark 

 brown ; 2 with two brown spots : in flowering shoots of Pyrus 

 aucuparia ; 5, 6. 



19. A. ephippella, F. 10-12 mm. Head white. Forewings 

 ferruginous-brown, towards costa anteriorly suffused with light 

 ochreous-yellowish, costa strigulated with dark brown ; a thick 

 whitish dorsal streak to tornus; a dark ferruginous -brown 

 fascia from -f- of costa to middle of dorsum ; three whitish 

 costal strigulae beyond it. Hindwings grey. 



England to Cumberland, N. Ireland, common ; C. Europe, 

 Asia Minor ; 7. Larva whitish ; head and plate of 2 pale 

 brown : in shoots of Prunus cerasus ; 4, 5. 



20. A. nitidella, F. (purpurascentella, Stt.) 10-11 mm. 

 Head white. Forewings shining ochreous- whitish, usually 

 strigulated and sometimes discally suffused with ferruginous- 

 brown ; a suffused ferruginous-brown median longitudinal 

 streak from base to before middle ; a curved dark ferrugin- 

 ous-brown fascia from middle of dorsum to -f of costa, some- 

 times obsolete except on dorsum. Hindwings grey. 



Britain to Perth, Ireland, very common ; C. Europe ; 7. 

 Larva yellow-green ; head and plate of 2 brown : in shoots of 

 hawthorn ; 5. 



21. A. albistria, Hw. 9-10 mm. Head white. Forewings 

 ferruginous-brown, purplish -tinged ; a white dorsal streak to 

 tornus, interrupted by a dark ferruginous -brown quadrate 

 median spot. Hindwings grey. 



England, N. Ireland, very common ; C. Europe ; 7. Larva 

 pale green ; a red band on each segment ; head and plate of 2 

 black : in shoots of blackthorn ; 5. 



