TRIFIDvE. 131 



which may safely be held to be British, since it was found, 

 overlooked, among a lot of the allied P. gamma in a British 

 cabinet. Thus its range with us, so far as known, is confined 

 to Dorset, Devon, Cornwall, and Surrey. Abroad it has a 

 wide range through Southern Europe — very common in Italy 

 — Hungary, Carniola ; Algeria and other portions of Northern 

 Africa to Aden; Asia Minor, Syria especially, Armenia, 

 India, China, Japan, the Cape de Verde Islands, St. Vincent, 

 Haiti ; and apparently in North America (under the name of 

 P. brassicce), throughout the United States, and in Canada. 



11. P. interrogationis, L— Expanse If to \\ inch. 

 Fore wings silvery-grey, abundantly marbled and rippled with 

 velvety-black; usual Y-spot short and thickened. Hind 

 wings yellow-brown with a dark hind-border. 



Antennae of the male simple, minutely ciliated, light brown ; 

 palpi short, broadly tufted and extremely hairy, the stiff 

 hair-scales bristling in front, dark purple-brown mixed with 

 white ; eyes black-brown, naked, thickly surrounded by long 

 dark lashes ; head purple-black, densely tufted, with longer 

 tufts between the antennas, but with the transverse channel 

 indistinct ; thorax pale purple-brown repeatedly barred with 

 black and white on the collar, shoulder lappets, and crest, 

 which last is large and broadly tipped with white ; fascicles 

 dusky yellowish-white; abdomen yellowish-grey, basal 

 portion covered with long paler hair-scales; dorsal ridge 

 ornamented with three or four black crests tipped with 

 white, the third the longest ; lateral and anal tufts rather 

 compressed. Fore wings narrow, the costa almost straight ; 

 apex bluntly angulated ; hind margin oblique, crenulated, 

 and faintly curved ; anal angle prominent and rather pro- 

 duced ; dorsal margin hollowed and gracefully curved ; colour 

 rich, silvery, purplish-grey, clouded and stippled with black ; 

 basal line double, composed of black curves edged outside 

 with white ; first line a series of silvery-white crescents and 

 angles, edged on both sides with deep black; second line 



