94 LEPIDOPTERA. 



to him identical with Pt. aridus. He then indicates a doubt 

 as to whether aridus is really distinct from serotinus, a point 

 which he leaves to the energy of British Lepidopterists to 

 determine. At page 88 (vol. vii.) of the E. M. M., Mr. 

 Gregson mentions having captured, in the Isle of Man, an 

 example which he finds, on comparison with Mr. D'Orville's 

 insect, to be identical with it, and adds that, so far as he 

 could ascertain from the rugged nature of the locality, the 

 food plant of Pt. serotinus (Knautia arvensis) was not 

 growing anywhere near. Some more positive proof must of 

 course be forthcoming before we can say positively that 

 aridus and serotinus are or are not distinct species. 



Kentish Town, 



November 27th, 1870. 



