278 NOTODONTINA [BISTON 



Fore wings pale greyish -ochreous, much sprinkled with dark 

 fuscous ; first line, median, second, and margins of subterminal 

 dark fuscous, first curved, double, second subsinuate, double ; 

 sometimes a dark fuscous discal spot. Hindwings as forewings, 

 but lighter, markings more indistinct, first line absent. 



England to York, Ayr, local; N. and C. Europe; 4, 5. 

 Larva reddish-brown or purplish-brown, with indistinct darker 

 lines ; 2 with a yellowish brown-marked transverse band ; 5-10 

 each with four yellowish dots; 12 with two prominences: on 

 elm, oak, etc. ; 6, 7. There is some evidence that in this 

 species, contrary to the usual rule, it is the <$ which attracts 

 the?. 



2. B. stratarius, Hufn. (prodromaria, Schiff.) 46-52 mm. 

 Antennae pectinated to apex. Forewings whitish, strigulated 

 with brown and black ; first and second lines twice angulate- 

 sinuate, blackish, first preceded and second followed by a brown 

 band ; median indistinct, on costa black ; a blackish discal spot. 

 Hindwings whitish, strigulated with grey ; median and second 

 lines straight, grey, second followed by a pale reddish tinge. 



England, rather common ; C. Europe ; 3, 4. Larva pale 

 ashy-grey, black - speckled ; 8 and 12 with pairs of small 

 prominences ; 9 with two larger reddish prominences, on a 

 reddish or yellowish mark ; head brown, yellowish-marked : on 

 oak, birch, elm ; 6, 7. 



3. B. betularius, L. 45-52 mm. Apex of antennae simple. 

 Forewings white, strigulated with black ; first and second lines 

 black, first curved, double, second twice angulate- sinuate ; 

 median indistinct, on costa black ; margins of subterminal 

 partly dark fuscous ; a blackish discal spot. Hindwings as 

 forewings, but first line absent. A wholly blackish variety is 

 locally common. 



Britain to Ross, N. and E. Ireland, common ; N. and C. 

 Europe, N. Asia ; 5, 6. Larva brown, grey, or greenish ; 9 and 

 1 2 with pairs of prominences ; head conspicuously bifid : on 

 elm, poplar, ash, etc. ; 8-10. 



18. DEILINIA, Hb. 



Face smooth. Tongue developed. Antennae in $ bipecti- 

 nated, towards apex simple. Palpi rough- scaled. Thorax 

 rather hairy beneath. Femora glabrous ; posterior tibiae in $ 

 not dilated. Forewings in c without fovea ; 10 out of 9, rarely 

 also 11 out of 9. Hindwings in $ with circular hair-fringed 

 fovea at base of 8 beneath. 



