CHALK HILL BLUE. 141 



Many varieties of this species have occurred, the eyes being more 

 or less distinct, and the brown more or less diffused over the wings 

 of the male. 



One, described as a species by Miss Jermyn, under the name of 

 'Polyommatus Cala;thys,' has the wings "above brown, with a blue disc 

 and a whitish discoidal spot with a black pupil; beneath, the posterior 

 wings have a discoidal, white, cinctured crescent, with a waved band 

 of seven undulated spots towards the hinder margin." 



The engraving is from specimens in my own cabinet. 



