PALIMPSESTIS] POLYPLOCIDAE 291 



faintly yellowish; head reddish - ochreous : between joined 

 leaves of poplar ; 8, 9. 



4. P. octogesima, Hb. (ocularis, Gn.) 32-34 mm. Forewings 

 light ochreous -grey, more brownish basally; subbasal line 

 double, grey ; a dark fuscous stria before first line, marked 

 with a small blackish spot in disc ; first and second lines 

 double, inner stria black, outer dark fuscous, parallel towards 

 costa; median dark grey; whitish 0-shaped orbicular and 

 8-shaped discal spots ; a dark stria beyond second line ; sub- 

 terminal obscurely whitish ; an oblique black apical dash. 

 Hindwings grey, with a pale postmedian fascia. 



5. England to Hereford and Norfolk, local; N. and C. 

 Europe, WC. and N. Asia ; 6. Larva pale yellowish, greenish- 

 tinged ; one lateral black spot on 4 and 1 2, two on 3, three 

 on 2 ; head orange -ochreous, black -marked : between joined 

 leaves of poplar ; 7-9. 



4. POLYPLOCA, Hb. 



Eyes hairy. Antennae in $ very shortly ciliated. Ter- 

 minal joint of palpi moderate. Abdomen sometimes with 

 small dorsal crest. Forewings : 6 out of 9. Hindwings : 5 

 approximated to 4 at base. 



Apparently restricted to a very few European species. Larva 

 living concealed amongst spun leaves of trees. 



1. First line of forewings white . . 3. ridens. 



not white . . .2. 



2. Forewings with two ochreous-brown fasciae 1. diluta. 



without ochreous-brown fasciae 2. flavicornis. 



1. P. diluta, F. 30-33 mm. Forewings light greyish- 

 ochreous, more brownish towards base, costa pink -tinged, 

 with indistinct fuscous striae ; first and second lines forming 

 ochreous-brown bisinuate dark -striated fasciae, dark fuscous 

 towards costa and on inner edge. Hindwings ochreous-grey- 

 whitish ; a grey median fascia and terminal band. 



England, Lanark, S. Ireland, rather common ; C. Europe ; 

 8, 9. Larva pale yellowish, becoming greyer laterally ; dorsal 

 line grey ; spiracular pale yellow ; dots black ; head fuscous : 

 between spun leaves of birch and oak : 6, 7. 



2. P. flavicornis, L. 37-39 mm. Forewings grey or dark 

 grey, slightly yellowish-tinged, suffused with whitish-ochreous 

 towards middle of costa, with some indistinct darker striae ; 

 first line formed by two or three and second by two dark grey 

 or partly black striae, diverging towards costa ; a rather large 



