xotodontaJ NOTODONTIDAE 305 



5, 8. Larva pale grey, brownish, or green, with darker lines ; 

 strong prominences on 6-8 and 12 ; a darker brown or grey 

 dorsal line ; spiracular brown or reddish-brown : on poplar or 

 sometimes birch ; 6, 7, 9. 



4. N. torva, Hh. 42-46 mm. Forewings fuscous, sprinkled 

 with pale greyish - ochreous ; first and second lines waved, 

 darker, externally pale-edged ; a darker pale-edged discal mark ; 

 praesubterminal line rather darkei*. Hindwings grey ; a pale 

 postmedian line. 



Norfolk, vei-y scarce but possibly overlooked ; C. Europe, N. 

 Asia ; 5, 8. Larva closely resembling that of JH. ziczac, but 

 much darker : on aspen ; 6, 7. 9. 



3. Drtmonia, ITb. 



Characters of Notodonta, but eyes glabrous ; dorsal scale- 

 tooth sometimes slight. 



A rather small genus, apparently confined to the Northern 

 hemisphere, especially in temperate regions. Larva without 

 pi'ominences or with one on 12 only. 



1. Forewings with blackish subdorsal streak . 2. 



,, without blackish subdorsal streak . 3. 



2. Torual mark of forewings white . .1. dictaeoides. 



„ ,, ,, brown, white-edged 2. trennda. 



3. Forewings witli whitish posterior fascia . . 4. 



,, without whitish posterior fascia 3. trepida. 



4. Forewings with dark fuscous discal mark . 5. chaonia. 



„ without dark fuscous discal mark 



4. trimacida. 



1. D. dictaeoides, Esjj. 42-50 mm. Forewings whitish, 

 towards middle of costa mixed with pale brownish ; an elongate 

 hlackish posterior costal blotch, marked with brown veins; a 

 broad blackish brown -suftused subdorsal streak, white-edged 

 beneath towards base and inmiddle, included dorsal space whitish- 

 ochreous anteriorly, brown posteriorly, with an elongate- 

 triangular wliite tornal mark ; a brown subterminal suffusion. 

 Hindwings whitish-fuscous, disc more whitish ; a dark fuscous 

 tornal suffusion. 



Britain to Sutherland, N. and E. Ireland, rather common ; 

 N. and C. Europe ; 5, 6, 8. Larva glossy purplish-brown ; a 

 prominence on 12 ; spiracular stripe yellow : on birch ; 7, 9. 



2. D. tremula, CI. (dictaea, Esp.) 45-54 mm. Differs from B. 

 dictaeoides as follows : forewings more brownish-mixed, tornal 



