312 NOTODONTINA [cbrura 



Asia ; 6, 7. Larva green ; a broad purplish yellow-edged dorsal 

 band, narrowed to end of 3, interrupted on 4, thence expanded 

 to 8, where it reaches .spiracles, and again narrowed to 12; 

 head brown : on poplar ; 7, 8. 



3. C. furcula, L. 32-38 mm. Differs from G. bifida as 

 follows : wings often greyer, forewings with anterior band and 

 posterior dark suffusion more or less mixed with orange, black 

 streaks more strongly orange-margined, posterior edge of band 

 more or less angulated inwards above middle, middle stria of 

 second line blacker towards costa. 



Britain to Ross, Irelaiid, common ; N. and C. Europe ; 6, 7. 

 Larva green ; a broad purplish whitish-edged dorsal band, 

 partially mixed with yellow or orange, narrowed to beginning 

 of 4, thence widened to 7, from 9 naiTowed to 12 ; head brown : 

 on Salix ; 7-9. 



4. 0. bicuspis, Bkh. 36-40 mm. Differs from C. bifida as 

 follows : forewings whiter, both edges of median band more or 

 less indented or bent inwards above middle. 



England to York, local and scarce ; C. Europe ; 5. Larva 

 green ; a broad reddish-brown yellow-edged dorsal band, nar- 

 rowed to 3, interrupted on 4, thence expanded to 8, where it 

 includes spiracle, again narrowed to 10, thence nearly even, 

 edges on 6-8 very deeply dentate : head reddish-brown : on 

 alder and birch ; 7-9. 



11. Phalbra, Hb. 



Eyes in S glabi'ous, in $ partly pubescent. Antennae in 

 S dentate, fasciculate -ciliated. Palpi rather short, rough- 

 haired. Thorax slightly crested posteriorly. Abdomen with 

 small dorsal crest. Forewings : 10 rising separate, connected or 

 anastomosing with 9. Hindwings : 8 approximated to end of cell. 



A rather limited genus, ranging over Europe, Asia, and the 

 Malayan islands. Larva without prominences, covered with 

 numerous fine silky hairs. 



1. P. bucephala, L. 56-62 mm. Head and front of thorax 

 yellowish, ferruginous-marked. Forewings brown mixed with 

 ashy-grey, suffused with whitish towards base and dorsum, with 

 ■waved darker striae ; subbasal line fine, blackish : first and 

 second double, inner stria black, outer ferruginous ; a transverse 

 whitish-edged discal spot ; a large oval pale ochreous-yellowisli 

 apical blotch, limited by second line, including two elongate 

 waved ochreous patches. Hindwings yellow-whitish ; two par- 

 tial indistinct fuscous postmedian striae. 



