148 



CHALK HILL BLUE. 



PLATE LXIII. 



Polyommatus Corydon, Lateeille. Stephens. Cuetis. 



" " Duncan. Wood. Jeemtn. 



" " Westwood. 



Hesperia Corydon, Fabeicius. Hubnee. Lewin. 



" " Donovan. Espee. 



Agriades Corydon, Hubnee. 



Papilio Tiphis, Espee, (female.) 



Papilio Calcethis, Jeemyn, fvar.J 



I believe I once took a specimen of this elegant butterfly, 

 which frequents the chalk districts on the Downs, a few miles 

 from Lambourne, Berkshire, near Ashdown Park, a very 

 singularly situated mansion, a sort of "Oasis in the desert." 

 It occurs abundantly near Newmarket, Cambridgeshire, where 

 I have captured it; and is not uncommon near Sarum, and 

 also at Martin's Hill, near Great Bedwyn, Wiltshire, where 

 J. W. Lukis, Esq. has obtained it, and also near Croydon, 

 Surrey, in some seasons; it is plentiful also on the grassy 

 slopes and pastures known as the "Downs" near Hunstanton, 

 Norfolk, as Mr. Robert Marris has informed me. Other localities 

 are Dover and Darenth Wood, Kent; Shoreham, Sussex; 

 Newport, in the Isle of Wight; Prestbury, near Cheltenham, 

 Gloucestershire; near Winchester, Hampshire; different parts 

 of Suffolk; and in Oxfordshire; and one was taken near 

 Knowle, Warwickshire. 



It appears the beginning of July. 



The caterpillar is said to feed on the wild thyme, f Thymus 

 Serpt/lluni.J 



The Chalk Hill Blue varies in the expanse of its wings from 

 an inch and a quarter to an inch and a half. The male has 



