304 XOTODONTIXA [notodonta 



3. Base of costa with a pale blotch . 2. dromedarius. 



„ „ without pale blotch . 4. torva. 



1. N. ziczac, L. 38-44 mm. Forewings light ochreous- 

 browu, veins partly dark fuscous ; median space white-sprinkled 

 on upper half ; subbasal, first, and second lines darker ochreous- 

 brown on upper half, obsolete beneath ; subterminal pale, 

 darker-edged ; a long crescentic discal mark, costa posteriorly, 

 and a subcostal praesubterminal dash very dark ochreous- 

 brown ; some fuscous suffusion beyond discal mark ; dorsal 

 edge dark fuscous. Hindwings whitish-fuscous ; a fuscous 

 discal crescent. 



Britain to Ross, Ireland, common ; N., C, and SW. Europe ; 

 5, 6, 8. Larva variable, pale ochreous, sometimes pinkish- 

 tinged, or purplish-grey; strong prominences on 6, 7, and 12; 

 darker pale-edged dorsal patches on 2-4; 11 and 12 usually 

 orange or yellow ; some whitish or yellowish oblique lateral 

 streaks ; spiracular line whitish, yellowish, or grey : on Salix 

 and poplar ; 6, 7, 9. 



2. N. dromedarius, L. 39-46 mm. Forewings rather dark 

 fuscous, costa whitish -sprinkled towards middle; a whitish- 

 ochreous ferruginous-mai'ked blotch on base of costa ; first and 

 second lines waved, darker fuscous, more or less edged ex- 

 ternally with whitish -ochreous, extremities of second more 

 strongly and followed by ferruginous suffusions ; a dark reddish- 

 fuscous pale-edged discal mark; praesubterminal line ferruginous 

 or dark reddish-fuscous. Hindwings rather dark grey ; a pale 

 postmedian line. 



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

 Europe ; 6. Larva variable, green, yellow, or yellowish-brown, 

 the green often forming oblique streaks on sides ; prominences 

 on 5-8 and 1 2 ; dorsal line purple-brown ; subspiracular usually 

 purple-brown ; head brown : on alder and sometimes birch ; 

 7-9. 



3. N. tritophus, Esp. 42-48 mm. Forewings dark fuscous, 

 costa white -sprinkled towards middle ; an ochreous -brown 

 blotch on base of costa, and a suffusion beneath middle of disc ; 

 first and second lines waved, hardly darker, more or less edged 

 externally with pale brown ; a large slightly curved ochreous- 

 brown whitish-edged discal mark ; subterminal line pale brown, 

 anteriorly darker-edged, near costa whitish. Hindwings whitish ; 

 a faint grey discal crescent and subterminal fascia ; tornal cilia 

 dark grey. 



Essex, Devon, Gloucester, Renfrew, very scarce ; C. Europe ; 



