158 THE BUTTERFLIES OF THE BRITISH ISLES. 



outer margin is narrowly bordered with blackish, and there 

 are some black dots on the outer margin of the hind wings ; 

 the fringes are white, and there is a slender tail on the hind wings. 

 The female is brownish, tinged with violet towards the base ; 

 the hind wings have black spots on the outer margin, and some 

 of these are inwardly edged with orange ; the tails are slightly 

 longer than those of the male. 



All the available information concerning the occurrence of 

 this species in England has already been given. No doubt 

 the localities from which specimens were recorded have been 

 closely investigated during the past twenty years, but no further 

 captures of this butterfly have been recorded. This seems to 

 indicate that it is not really indigenous, but that its presence 

 here may possibly have been due to accidental introduction. 



The spring form, ftolysperchon, is smaller than the specimens 

 occurring in the summer, but so far that form has not been 

 seen in England. 



The species is widely distributed over Central and Southern 

 Europe, and its range extends through Northern Asia to 

 Amurland, Corea, and Japan. It is also represented in 

 Northern and Central America by var. comyntas, and has been 

 recorded from Australia. 



The Silver-studded Blue (Lyccena argus = agon).. 



The male of this butterfly (Plate 105) is purplish-blue with 

 a black border on the outer margins, and sometimes black 

 dots on that of the hind wings. The female is sooty-brown, 

 powdered to a greater or lesser extent with blue scales on the 

 basal area ; there is generally a series of orange marks forming 

 a more or less complete band on the outer margin of the 

 hind wings, and sometimes on the fore wings also. The under 

 side is bluish-grey in the male, and brownish-grey in the 

 female ; the black spots are ringed with white, and on the 



