234 
ALCON BLUE BUTTERFLY. 
This beautiful insect, which is extremely rare in 
Britain, and not of frequent occurrence on the Con- 
tinent, is said by Lewin to hare been taken on Do- 
ver Cliffs, Marlborough Downs, and on the hills near 
Bath. Miss Jermyn mentions the commons at 
Broomham in Bedfordshire, and certain places in 
North Wales, as having afforded it. More recently 
it was found by Mr Dale in the neighbourhood of 
Bedford. 
ALCON BLUE BUTTERFLY. 
Polyommcitus Alcon. 
PLATE XXXII. Fig. 2. 
Polyommatus Alcon, Latreille . — Hesperia Alcon, Fabr 
Pap. Alcon, Hubner. 
Surface of the male violet-blue, with a rather wide 
brown border to all the wings, and a dark crescent 
on the disk of the upper pair ; of the female dusky 
brown, tinged with blue towards the body. Under 
side greyish in both sexes, with a central crescent- 
shaped spot, bordered with white, on each wing; 
behind this there is a curved row of rather large 
rounded black spots, and two exterior rows of tri- 
angular marks, all of them encircled with white ; the 
basal half of the hinder wings is tinged with blue, and 
bears a few scattered spots in addition to those cor- 
