LARENTW.£—EUP/THECTA. 53 



NoL very variable, but occasional specimens show faint 

 traces of a slender dark brown basal line, or of this and the 

 second line or even all the usual lines and a pale angulated 

 stripe following the second line, but usually these markings 

 are faint. In rare instances — more frequent in the east of 

 Scotland — the usually fulvous area is filled in with these 

 lines and a grey-brown mottling, so that the brighter colour 

 is almost, or even quite, obliterated. This series of forms is 

 known under the varietal name of cognata. 



On the wing in July and August. 



Larva long, tapering but slightly towards the head ; 

 reddish-brown, with a series of oval dusky olive dorsal spots 

 confluent towards the head and tail, and connected and 

 intersected by a dorsal line paler in colour ; subdorsal lines 

 black, interrupted, dark opposite the dorsal blotches, pale 

 and almost or quite evanescent between them ; spiracular 

 lines white ; dorsal region thickly studded with minute 

 white tubercles and less thickly with whitish hairs ; under- 

 surface whitish, with a central purplish line running thf) 

 whole length. A variety has the ground colour pale yellowish - 

 brown with similar markings. (Rev. H. H. Crewe.) 



This is a redder larva than that of the last species and its 

 dorsal spots are narrower and more ovate. 



September and October, on Achillea millefolium, (milfoil 

 or yarrow), feeding at night on the flowers, seeds and leaves ; 

 ordinarily remaining upon the plant by day, lying along the 

 midrib of a leaf, which it so closely resembles as to become 

 almost invisible ; or sometimes at full length along a stem. 

 Occasionally also on flowers of tansy (Tanacctum vulgarc); and 

 Mr. Prout states that in confinement it will feed willingly on 

 the blossoms of garden chrysanthemum (C. sinense). 



Pupa not very stout, but having the wing-covers thickened 

 at the margins and also ribbed at the nervures, roughened 

 with abundant and rather coarse sculpture of incised lines 

 and pits ; eye-covers not very prominent, smooth ; antenna- 



