TRIFID.^. 5? 



Sligo, Tyrone, Antrim, Armagh, Fermanagh, aud Lunrlou- 



derry. 



Abroad its range is immense— Northern Europe, the greater 

 portion of Central Europe, Eastern and Western Siberia, 

 Bombay, Ceylon, the North-Western Himalayas, the Nilgiris, 

 and other mountainous regions of India ; Japan ; throughout 

 the United States, and in abundance, and large in size, in 

 Canada. 



8. N. ditrapezium, 57.7^.— Expanse U to If inch. Fore 

 wings long, with the dorsal margin slightly hollowed ; dark 

 or bright purple-brown ; near the costa are three paler spots 

 separated by squared black spaces ; before the apex is a small 

 black wedge ; hind wings pale yellowish-grey. 



Antenna? of the male threadlike, most minutely cihated, 

 brown ; palpi strongly tufted, purple-brown ; head and thorax 

 pale purple-brown; collar paler, barred toward its upper 

 edge with a slender yellow line edged with reddish-brown ; 

 top and back crests present, but small and inconspicuous ; 

 fascicles small, whitish; abdomen glistening whitish-drab, 

 barred with series of long white scales ; lateral aud anal tufts 

 tinged with reddish. Fore wings rather narrow, particularly 

 at the base ; costa decidedly curved, especially so toward the 

 apex, which is rounded, as also is the hind margin ; dorsal 

 margin faintly hollowed ; colour purple-brown with a rich 

 glow of purplish-chocolate ; the basal line consists of two deep 

 black spots, the lower of which is edged outwardly by a white 

 streak followed by a deep purple-black cloud ; first line un- 

 usually straight, oblique, double, blackish ; second line curved, 

 scalloped throughout, purple-brown; followed by a nearly 

 duplicate but less distinct, cloudy blackish line of crescents, 

 each of which is tipped with a black dot, beyond which is 

 another similar dot ; on the costa are several black dots or 

 cloudy spots, and before the apex a triangular or wedge- 

 shaped black spot, from which arises a dusky transverse 

 shade ed^-ing the subterminal line, which is yellowish ; orbi- 



