TRIFID.-E. 171 



Cumberland, and but once recorded In Yorkshire. In 

 North Wales it has been taken near Barmouth, and in 

 South Wales, rarely, in one wood in Pembrokeshire. Much 

 more plentiful in Scotland, though local; found in Perthshire, 

 Argyleshire, Ross-shire, Aberdeenshire, Moray, Inverness 

 and Bute. In Ireland widely distributed though apparently 

 never common, more particularly affecting hill districts ; it 

 is recorded from Wicklow, Waterford, Cork, Kerry, Galway, 

 Sligo, Westmeath, and the Mourne Mountains in the county 

 Down. 



Abroad it seems to occur throughout Central Europe, the 

 temperate portions of Northern Europe, North Italy, the 

 Ural mountain district, and the mountain regions of Central 

 Asia. 



2. H. thalassina, Rott. — Expanse H to If inch. Fore 

 wings rich purple-brown marbled with darker ; a yellowish- 

 white blotch at the base ; orbicular stigma and transverse 

 lines whitish ; a conspicuous W near the hind margin run- 

 ning into the cilia. Hind wings pale brown. 



Antennae of the male simple, very minutely ciliated, dark 

 brown, shaft barred with pale yellow ; palpi strongly tufted, 

 purple-brown, paler in front, apical joint small ; head pale 

 yellow with a projecting brown transverse tuft between the 

 antennae ; collar reddish-grey with an orange gloss, crossed 

 by a slender yet distinct purple-black bar ; shoulder lappets 

 purple-brown, edged on both sides with black ; remainder of 

 thorax paler purplish-grey, very strongly crested on the top 

 and back, the tufts tipped with deep purple-black and barred 

 with red-brown ; fascicles dirty white ; abdomen pale smoky- 

 brown with long paler hairs on the basal segments, and on 

 the dorsal ridge a series of five raised crests or tufts tipped 

 with purple-black, the third being by far the largest ; lateral 

 and anal tufts spreading, tinged with reddish. Fore wings 

 somewhat ovate, costa very gently rounded ; apex bluntly 

 angulated ; hind margin regularly curved ; dorsal margin 



