TORTRICIDAE 



9. Hindwings with 6 and 7 remote at base . 10. Isotbias. 

 „ „ „ closely approximated or 



stalked . .10. 



10. Hindvvings with 4 absent . . 12. Chbimatoi-hila. 



„ „ present • • .11. 



11. Tongue absent . . . . ' 11. Exapate. 



„ present . . . .9. Tortkix. 



1. KnAcoDiA, Hb. 



Antennae in $ shortly ciliated. Palpi moderately long, 

 porrccted. Thorax with longitudinal posterior crest. Fore- 

 wings without costal fold, costa broadly emarginatc 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 Bpeoies. 



1. R. caudana, F. 17-21 mm. Forcwings pale ochrcous, 

 deep reddish-ochrcous, 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 ochrcous-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, lib. 



Antennae in 3 shortly ciliated 

 porrccted. 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 base 



Palpi moderately long, 



NYilralii'ii Of ActUltt WlHfiffOWO. 



. The species are often so 

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



