214 NOTODONTINA [hydeiomena 



portions of its range than it is hei-e, and no distinct line of 

 demarcation can at present be drawn. Probably the two races 

 may be species in process of formation. 



14. H. silaceata, Hb. 25-29 mm. Forewings rather dark 

 fuscous, with darlcer striae ; edge of basal patch whitish, 

 obtusely angulated above middle ; veins on antemedian space 

 and beyond median band, usually also on lower half of median 

 band pale ochreous ; edges of median band white, anterior 

 angulated in middle, posterior sinuate, followed by a whitish- 

 ochreous stria ; a blackish discal mark ; subterminal line white, 

 preceded by blackish -fuscous spots; an irregidar white-edged 

 blackish-fuscous subapical blotch. Hindwings light grey, with 

 darker striae and discal dot. 



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

 N. Asia, N. America ; 5, 6. Larva slender, pale green ; a 

 dorsal series of reddish - brown dots : on Epilohium and 

 Circaea ; 7. 



15. H. corylata, Thnh. 24-28 mm. Forewings yellowish- 

 brown ; basal patch rather dark brown, edge white, irregular ; 

 median band rather dark brown, sometimes interrupted below 

 middle, edges white, irregularly waved; a blackish discal 

 mark ; subterminal line white ; a terminal median, and apical 

 spot suffused with white. Hindwings pale whitish -fuscous ; 

 a dark grey discal dot ; a faint pale darkei'-edged postmedian 

 fascia. 



Britain to Sutherland, Ireland, common ; N. and C. Europe, 

 N. Asia ; 5, 6. Larva reddish-ochreous, greenish-tinged, with 

 brown tubercles ; dorsal stripe of four reddish-brown lines, on 

 5-10 replaced by dark diamond-shaped marks : on blackthorn, 

 hawthorn, etc. ; 7-9. 



16. H. suffumata, Hh. 28-32 nmi. Forewings yellowish- 

 fuscous mixed with dark fuscous ; basal patch dark brown, 

 edge white, curved : two yellow-whitish striae before and three 

 beyond median band ; median band dark brown, anterior edge 

 dentate, posterior with strong double median projection ; a black 

 discal mark ; subterminal line white, interrupted ; a white 

 oblique apical streak. Hindwings light grey, with faint darker 

 striae ; an angulated whitish postmedian fascia. 



Britain to the Hebrides, Ireland, rather common ; N. and 

 C. Europe, NVV. Asia; 5. Larva pinkish-grey, greenish-grey, 

 or ochreous-brown ; dorsal line pale on 2-4, dark on 10-13; on 

 5-9 a series of dark grey V-shaped marks ending in pink tri- 

 angles enclosing a white dot : on Galium ; 6-8. 



