TRIFID.E. 121 



blackish; outside this a faint band of smoky clouding. 

 Hind wings pale yellowish-grey, broadly dusted with brown 

 along the costal region ; central spot large, smoky-black, 

 followed by a sinuous grey-brown slender transverse stripe, 

 a broader cloudy stripe lies along the hind margin. Body,- 

 legs, leg tufts, and anal tuft yellowish-brown. 



This description is made from a form found in the Shet- 

 land Isles which shows considerable agreement with the 

 prevailing type as found in Iceland — though the latter has 

 the transverse lines more white with a black edging, the 

 reniform stigma whitish, the nervures much streaked with 

 white, and is decidedly smaller in size. . . 



In this country the species has long been known by 

 another, and apparently more rare, variety called {Hadena) 

 assimilis, Dbld. Its fore wings are scarcely so wide, their 

 ground colour more of. a reddish-black ; the transverse lines 

 dull red, the second line broadly so ; nervures less streaked 

 with white ; reniform stigma more obscured by the dark 

 ground colour and with only its outei: edge red-brown ; 

 orbicular stigma also obscured ; thorax of the colour of the 

 fore wings. This form very closely resembles Eurois 

 adusta in its more reddish-black varieties, and thi? similarity 

 has at times been the cause of sad disappointment. The 

 present is, however, a more robust insect than E. adusta, 

 having a broader thorax and the forewings more obtuse at 

 the apex. It is found in Scotland ranging from black- 

 brown or red-black with the markings obscure, to red-brown 

 with yellow lines and crescent spots, pointing in the direction 

 of the Shetland form first described. Some of these latter 

 in the collection of Mr. W. H. B. Fletcher, with the trans- 

 verse lines and nervures dull yellowish, have the interspaces 

 filled in with black, or with black-brown ; others are pale 

 grey with whitish lines and nervures ; others intermediate 

 but much dusted and lined with yellow ; and one is brownish- 

 buff with very scanty black interspaces. Mr. Sydney Webb, 

 along with some of these variations, has one, in the late Mr. 



