THE ENTOMOLOGIST. 159 



Earliest and latest dates of the appearance of some of the 

 rarer British Butterflies. 



By the late J. C. Dale, Esq., F.LS. 



[Knowing how much interest 1 felt in everything connected 

 with British butterflies, Mr. Dale most kindly sent me the 

 following letter, which, in addition to its utility, will be 

 interesting as evincing the writer's zeal in the cause of 

 Science. — Editard Newman.^ 



1 have been looking over some of the extracted dates of 

 British butterflies, especially the earliest and latest observed. 



