140 CARADRININA [ACRONYCTA 



5. Forewings more or less sprinkled with dark 



fuscous . . . .6. 



not sprinkled with dark fuscous . 11. 



6. Black basal dash tolerably defined . .7. 



,, nearly obsolete . . .10. 



7. Hindwings white . . . .8. 



,, at most whitish anteriorly . .9. 



8. First line distinct towards costa only . 1. leporina. 



throughout . . 7. aceris. 



9. Subterminal line whitish . . .10. auricoma. 



obsolete . . 12. menyanihidis. 



10. Reniform broadly pale-suffused . 6. megacephala. 



not pale-suffused . .11. euphorbiae. 



11. Forewings tinged with rosy-purplish . 4. tridens. 



,, not so tinged . . . .5. psi. 



1. A. leporina, L. 37-44 mm. Forewings whitish, sprinkled 

 with dark fuscous ; a short black median basal dash ; first line 

 indicated by a black mark on costa and traces elsewhere, median 

 by a strong black costal mark, second black, waved, inter- 

 rupted ; small orbicular and narrow reniform indistinctly 

 blackish - outlined ; base of cilia black -spotted. Hindwings 

 white. 



Britain to Sutherland, E. and S. Ireland, not common ; N. 

 and C. Europe, N. Asia ; 6. Larva green or greenish-yellow ; 

 sometimes obscure red-brownish dorsal and lateral suffusions ; 

 numerous very long white or yellowish hairs, directed forwards 

 on right side and backwards on left ; sometimes dorsal tufts of 

 black hairs; head sometimes black - mark ed : on alder, birch, 

 elm, Salix; 7-9. 



2. A. alni, L. 37-42 mm. Thorax grey- whitish, with a 

 black lateral stripe. Forewings grey-whitish, irregularly mixed 

 with pale brownish ; dorsal half blackish from base to tornus, 

 united with a broad blackish-fuscous median fascia ; first and 

 second lines blackish ; reniform indistinctly indicated ; subter- 

 minal line obscurely pale ; a black dash before termen above 

 middle. Hindwings white, termen fuscous-sprinkled. 



England to York, E. Ireland, scarce; C. Europe; 6, 7. 

 Larva black ; a series of transverse yellow bands ; 2 with four, 

 5-10, 12, 13 each with two long black hairs with broadly 

 flattened tips ; head black : on alder, birch, beech, Cornus, 

 etc.; 7-9. When young, the larva is quite different, being 

 whitish, with 5-10 suffused with slaty-grey, 5-9 subprominent 

 above ; in this stage it usually rests with the head bent round 



