PIEIUD.E. 35 



just possible that the species nvvj occur, unnoticed, every year 

 on some of the warmest slopes of our South Coast, and that 

 thus it may maintain itself as a veritable native, increasing in 

 numbers and spreading over the country in favourable years, 

 but there can be little doubt that tlie numerous specimens 

 occasionally met with consist mainly of those which, finding 

 tliemselves crowded in their warmer continental localities, 

 have been stirred by a migratory impulse, and found their way 

 across the sea. In the most favourable seasons the offspring 

 of such immigrants, finding sunshine sufficient to allow them 

 to feed up, would produce the fresh specimens observed in 

 sucli widely scattered localities. 



It has occurred in all the southern and south-eastern 

 counties, and probably in all the midland and western midland, 

 and has even been found in Yorkshire ; but is extremely rare 

 in Wales and the south-western counties, and apparently not 

 observed in Scotland. In Ireland it was formerly taken on the 

 south and east coasts. It flies in clover and lucerne fields and 

 over chalky slopes, as well as about grassy places near the sea. 



Mr. Farren has recorded that this butterfly has a scent of 

 pine-apple, but this circumstance does not seem to have been 

 elsewhere noticed. 



When at rest, with closed wings, its colour and shape are 

 those of a faded yellow clover leaf, and the protective re- 

 semblance is greatly heightened by the central spot of the hind 

 wings, which resembles a spot of " rust " fungus. 



2. C. Edusa, F. — Expnnse, If to 2i inches ; rich orange 

 — occasionally white — with a central black spot on the foie 

 wings, and a broad black margin to fore nnd hind wings. 



Itich orange. Fore wings of the male tinged witli grey at 

 the base and along the costal margin, having a black central 

 spot, and a broad blackish band, indented within, extending 

 round the apex and hind margin, broadest towards the 

 costa, the nervures which cross it narrowly yellow, and 

 very often the whole surface dusted with yellow scales. 



