THE ENTOMOLOGIST. 351 



orichalcea, Phlogophora empyrea, Pieris Daplidice, and 

 Argynnis Lathonia, which possess powers of flight sufficient 

 at any time to enable them to cross the " silver streak." 



Mr. Birchall also exhibited a large number of British 

 Lepidoptera, contrasted with continental examples of the 

 same species, and pointed out that the variation from the 

 continental (or what may be considered the original) .type 

 was so great, that in a large proportion of our species it is 

 easy to say, at a glance, whether a specimen is British or 

 foreign ; thus indicating that the lapse of time, since the 

 migration or insulation took place, has been sufficiently long 

 to allow of great changes of form and colour, in many cases 

 amounting to what we can scarcely refuse to call the 

 development of a new species. 



Specimens from the Isle of Man appeared to indicate that 

 insular conditions have there operated with exceptional 

 force. 



Corsican and Sardinian Lepidoptera were also compared 

 with continental examples of the same insect, and were 

 found to vary from the original types still more than British 

 insects do, thus probably indicating a longer period of 

 isolation. 



Specimens were also shown of Nonagria concolor, Noctua 

 subrosea, and Dianthoecia Barrettii, the only three British 

 Macro-Lepidoptera not known to have occurred on the 

 continent of Europe. 



W. D. Roebuck {Sec. to the Club). 



A List of the Nocturnal Macro-Lepidoptera inhabiting 

 Guernsey and Sark, with Notes of their Occurrence. 

 By W. A. Luff, Esq. 



(See p. 324 for the Butterflies: to these must he added Argynnis Paphia, 

 of which Mrs. Boley took specimens in Sark several years ago.) 



Sphinges. 



Smerinthus ocellatus. — I have seen several specimens 

 which were taken in Guernsey. 



S. Populi. — The larvae are common in the autumn on 

 poplar trees in Guernsey, and I have found them feeding on 

 lauruslinus in the hedge;^. 



