88 LEPIDOPTERA. 



the white hairs, already mentioned, on the upper side of the 

 fore wings, and which this species possesses in gi-eater abund- 

 ance than any other, except the very singular P. Bolus, a 

 South European species. Corydon is a swift and . active 

 butterfly, strongly attached to chalk formations, yet roving at 

 times to long distances, as when a specimen found its way 

 into Ladbroke Square, Netting Hill, London, in August 1864, 

 and was there secured by Mr. A. H. Clarke ! It is abundant 

 on the chalk hillsides of Kent, Sussex, Surrey, Berks, Bucks 

 and Oxfordshire ; also in Cambridgeshire and on one chalk 

 hill in Norfolk ; on the oolite as well as the chalk in Wilts, 

 Dorset, Gloucestershire and Somerset ; and on limestone at 

 Grange and Silverdale in North Lancashire, in Lincolnshire, 

 Westmoreland and Cumberland. It is, or has been, also 

 taken in Essex, Hants, Cornwall, and in one locality in 

 Glamorganshire. Sjoecimens taken elsewhere seem to have 

 been mere wanderers. 



On the continent of Europe it is an abundant and widely 

 distributed insect, by no means confined to chalk districts, 

 but found in plenty in meadows, pastures, and hillsides, irre- 

 spective of geological formation, from May to September. 

 Also found in Western Asia. 



It may be of interest to point out here, that the last five 

 species show, to a great extent, the same phases of variation. 

 Males of all are found more or less pale, or dark, or diaphanous ; 

 females (except in Agcstii) tinged or suffused with blue on 

 the upper side ; under sides smoky, or having the spots elon- 

 gated, or coalescing, or in other instances obsolete ; in all 

 which cases, I think, the central spot of the fore wings 

 remains intact. 



6. P. Argiolus, L. — Expanse, 1^ to If inch. Lilac 

 blue, dark bordered in the female. Under side pale blue with 

 a few black dots. 



Light blue, with a lilac gloss ; costal margin paler. Male 

 having a black line round the apical and hind margins ; female 



