TORTRICIDAE 



519 



9. Hind wings with 6 and 7 remote at base . 10. ISOTRIAS. 

 closely approximated or 



stalked . .10. 



10. Hindwings with 4 absent . . 12. CHEIMATOPHILA. 



present . . .11. 



11. Tongue absent . . . .11. EXAPATE. 



present . . . .9. TORTRIX. 



1. RHACODIA, Hb. 



Antennae in $ shortly ciliated. Palpi moderately long, 

 porrected. Thorax with longitudinal posterior crest. Fore- 

 wings without costal fold, costa broadly emarginate beyond 

 middle, surface with slight scale-tufts ; 7 to costa. Hindwings : 

 3 and 4 connate, 5 closely approximated to 4, 6 and 7 closely 

 approximated towards base. 



There is but one species. 



1. E. caudana, F. 17-21 mm. Fore wings pale ochreous, 

 deep reddish-ochreous, or brown, striated and veined with dark 

 fuscous or ferruginous ; dorsum sometimes deep ferruginous ; 

 central fascia and costal patch dark fuscous, more or less con- 

 fluent, sometimes obsolete. Hindwings light grey, strigulated 

 with darker ; apex sometimes ochreous-tinged. 



Britain to the Orkneys, Ireland, common ; N. and C. Europe, 

 N. America ; 8. Larva pale green ; head pale yellowish : on 

 Salix; 5, 6. 



2. ACALLA, Hb. 



Antennae in $ shortly ciliated. Palpi moderately long, 

 porrected. Thorax sometimes with 

 posterior crest. Forewings with- 

 out costal fold, surface usually 

 with scale- tufts ; 3 and 4 some- 

 times stalked, 7 to costa. Hind- 

 wings : 3 and 4 connate or short- 

 stalked, 5 approximated to 4, 6 

 and 7 closely approximated to- 

 wards base. 



A genus of some extent, ap- 

 parently entirely confined to 

 northern temperate regions. 

 Imago with forewings often very 

 oblong, the costa being usually 



strongly arched towards the buise. The species are often so 

 remarkably variable (probably A. cristana and A. hastiana are 



