206 NOTODONTINA [PLEMYRIA 



Britain to Sutherland, Ireland, common (very local in S. 

 England) ; N. and C. Europe, Asia Minor, N. America ; 6. 

 Larva brown ; dorsal line black ; subdorsal and lateral narrow, 

 white, black-edged : on Galium ; 7, 8. 



4. P. rivata, Hb. 26-28 mm. Forewings white, partly 

 ochreous-tinged ; markings grey, mixed with brown and striated 

 with dark fuscous ; a basal patch, edge slightly curved ; second 

 fascia cloudy ; median band with posterior edge blackish - 

 marked, projecting obtusely in middle; a black discal spot; 

 fifth and sixth fasciae narrowed and more indistinct in middle, 

 anterior edge of fifth even. Hind wings white ; basal third grey- 

 sprinkled ; three grey median striae, third darker-dotted, obsolete 

 above middle; a blackish discal dot; a grey terminal band, 

 including white subterminal line. 



Britain to Perth, S. Ireland, rather common ; C. Europe, 

 WC. and N. Asia; 7. Larva dull brown or reddish -brown ; 

 dorsal line blackish, white-edged on 2-4 and 10-13, replaced on 

 5-8 by white U-shaped marks : on Galium ; 6. 



5. P. sociata, Bkh. (subtristata, Hw. ; biriviata, Stt.) 23-25 

 mm. Differs from P. rivata as follows : grey markings darker, 

 stronger, a well-marked grey stria on each side of median band 

 of fore wings (in P. rivata indicated only) and beyond median 

 striae of hind wings, anterior edge of fifth fascia distinctly serrate. 



Britain to the Orkneys, Ireland, very common ; N. and C. 

 Europe, WC. and N. Asia, N. America ; 5, 7. Larva brownish- 

 ochreous; dorsal line dark brown on 2-4 and 11-13, replaced on 

 5-10 by V-shaped marks of brown and white lines, ending in 

 white spots ; sides marked with ochreous-whitish lines : on 

 Galium; 6, 8, 9. 



6. P. galiata, Hb. 24-27 mm. Forewings ochreous- white, 

 with light ochreous or grey striae ; basal patch brownish, 

 striated with dark fuscous, edge slightly projecting above 

 middle ; median band brown striated with black, central space 

 dark grey, posterior edge with rounded double median pro- 

 jection ; a small black discal mark ; a dark grey costal suffusion 

 before subterminal line ; a brownish terminal suffusion above 

 middle. Hindwings ochreous-whitish, with grey striae, some- 

 times faint ; a grey discal dot. 



Britain to Perth, Ireland, rather local ; C. and S. Europe, 

 WC. and N. Asia, N. Africa ; 6. Larva pale reddish-ochreous ; 

 dorsal line brownish, on 2-4 and 10-13 dark brown; subdorsal 

 white, brown-edged ; spiracular pale, edged with series of brown 

 white-edged marks : on Galium ; 8, 9. 



