139 



CHALK HILL BLUE. 



PLATE LXIV. 



Polyommatus Corydoti, Latreille. Stephens. Curtis. 



" " Duncan. Wood. Jermv.v. 



" " West WOOD. 



Hesperia Corydon, Fabricius. Hubner. Lewin. 



" " Donovan. Esper. 



Agriades Corydon. Hubner. 



Papilio Tiphis, EsPER, {female.) 



" Calctthis, Jermyn, {var.') 



I believe 1 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, the seat of Lord Craven, a very 

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

 abundantly in Epping Forest, in Essex, and near Cherry Hinton, the 

 Gogmagog Hills, and Newmarket, Cambridgeshire, where I have 

 captured itj 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; at Brighton, 

 in Sussex; Blean Down, Weston-super-Mare, and Wells, in Somerset- 

 shire; it is plentiful also on the grassy slopes and pastures known as the 

 "Downs" near Hunstanton, Norfolk, as Mr. Robert Marris has informed 

 me; so too at Grange, in Lancashire. Other localities are Dover and 

 Darenth Wood, Kent; Shoreham, Sussex; Prestbury, near Cheltenham, 

 Gloucestershire; Bisterne, near Winchester, and Newport, in the Isle 

 of Wight, Hampshire; different jjarts of Suffolk; and in Oxfordshire: 

 one was taken near Knowle, Warwickshire; also at Notting Hill, 

 London; and Lulworth Cove, Dorsetshire. 



It appears the beginning of July, and is out in August. 



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

 Serpyllum.) 



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



