HYDRIOMENA] HYDRIOMENIDAE 215 



17. H. caesiata, Lang. 31-34 mm. Fore wings yellow- 

 whitish, densely sprinkled with dark fuscous, with dark fuscous 

 striae ; median band more or less suffused with fuscous, edges 

 curved, strongly waved, whiter-margined ; a blackish discal 

 mark ; subterminal line whiter ; cilia distinctly barred. Hind- 

 wings whitish-grey, with two faint posterior striae ; a dark grey 

 discal dot. 



Devon, Gloucester, Wales, N. England to the Shetlauds, 

 Ireland, common on mountains ; N. and mountains of C. Europe, 

 NW. Asia, N. America; 6, 7. Larva green or deep reddish- 

 brown; a dorsal series of 7 or 8 V-shaped marks, yellow in 

 front, pink behind, edged with dark brown; dorsal line yel- 

 lowish or reddish ; spiracular white or yellowish : on Calluna, 

 Vaccinium, etc.; 9-5. 



18. H. flavicinctata, Hb. (ruficinctata, Gn.) 31-34 mm. 

 Differs from H. caesiata as follows : forewings largely suf- 

 fused with ochreous-yellow ; hindwings more fuscous towards 

 termen. 



N. England to Sutherland, on mountains, local ; mountains 

 of .N. and C. Europe ; 7. Larva dark purplish-grey, green, or 

 pale green suffused with dark red ; a dorsal series of 7 or 8 

 V-shaped marks, yellow in front, pink behind, edged with 

 dark brown ; dorsal line dark red ; spiracular ochreous or pale 

 yellowish : on Saxifraga aizoides ; 9-5. 



19. H. dubitata, L. 32-40 mm. Forewings rosy-fuscous, 

 with dark fuscous striae ; striae limiting basal patch and median 

 band mixed w ith w hitish-ochreous ; edges of median band somewhat 

 suffused with darker fuscous, posterior with projection beneath 

 costa and obtusely angulated in middle ; a black discal mark ; 

 subterminal line pale whitish-ochreous, sometimes obsolete except 

 a stronger tornal mark. Hindwings fuscous, with darker striae, 

 veins pale-marked ; a darker discal dot ; termen dentate. 



Britain to the Clyde, N. Ireland, common ; C. Europe, Asia 

 Minor, N. America ; 8-4. Larva yellowish-green ; dorsal line 

 darker, yellow-edged; subdorsal pale yellow, interrupted; 

 spiracular bright yellow : on blackthorn and Rhamnus ; 5, 6. 



20. H. badiata, Hb. 28-31 mm. Forewings reddish-ochreous- 

 brown ; edge of basal patch dark fuscous, acutely angulated 

 above middle ; pairs of pale striae limiting median band, which 

 is formed by dark-striated fasciae enclosing a pale or whitish- 

 ochreous space, anterior, and upper half of posterior edge 

 blackish -fuscous, lower half of posterior strongly waved; a 

 blackish discal dot ; an irregular blackish apical dash ; a whitish 



