CHALK-HILL BLUE BUTTERFLY. 
235 
responding to the markings of the superior wings: 
fringe white, spotted with brown. 
As this insect appears to have been found only 
once in this country, and is not figured by any Bri- 
tish author, we have been obliged in this instance to 
deviate from our usual practice, and introduce a fi- 
gure taken from a foreign specimen. It does not 
entirely correspond to Mr Stephens’s description of 
the supposed indigenous example discovered by Mr 
Jones in Buckinghamshire; and should the latter be 
found, as has been conjectured, to be only a variety 
of P. Priori, we must exclude the present species 
from our native catalogues. 
CHALK-HILL BLUE BUTTERFLY. 
Polyommatus Corydon. 
PLATE XXXII. Fig. 3. 
Pap. Corydon, Donovan, vii. pi. 131. f. I. (J Stephens 
Illus. i. 88 Lewin, pi. 36 — The Chalk-Hill Blue But- 
terfly, Harris. 
One of the larger species, generally measuring 
17 or 18 lines across the wings. The surface of 
the male is a very light silvery blue, with a fine silky 
lustre, the hinder margin of all the wings having a 
blackish band, surmounted in the hinder pair by a 
series of dusky, somewhat ocellated spots : the sur- 
