DESCKIPTIVE NOTICES OF CONSPICUOUS SPECIES 117 



The expansion of the wings is only from f of an inch 

 to an inch. 



Another of our blue butterflies is Polyommatus Acis, 

 now of rare occurrence. Like the two preceding 

 species, it has no red spots on the underside of the 

 wings, but there is a distinct row of marginal black 

 spots in white rings on each wing. 



FAMILY IV. LYC^NID^:. 



POLYOMMATUS AEION. THE LAKGE BLUE 

 BUTTERFLY. 



Also a local species, occurring in Northamptonshire 

 and Devonshire in July. It is the largest of our blue 

 butterflies, and is immediately known by the black 

 spots in the centre of the upper side of the fore-wings. 



Expansion of the wings about 1^ inch. The fore- 

 wings are deep rich blue, spotted with black in the 

 centre, with the hind margin broad and blackish ; the 

 hind-wings are deep rich blue, with a broad blackish 

 hind margin. 



FAMILY IV. LYCJENID^E. 



POLYOMMATUS ADONIS. THE CLIFDEN 

 BLUE BUTTEEFLY. 



(Plate II. , Fig. 4.) 



This beautiful insect is not uncommon in chalky and 

 limestone localities in the south of England. 



The expansion of the wings is from 1J to 1| inch. 

 The wings of the male are above of a bright smalt blue, 

 with the fringes whitish, chequered with dark fuscous ; 

 the wings of the female are brownish-slate colour. On 



