NEW BRITISH SPECIES SINCE 1853. 46 



p. 115); one, September 9th, near Ryde, by Mr. Ingram 

 (Ent. Monthly Mag. vol. ii. p. 134), and another seen; and 

 one captured by Mr. Dale in the Isle of Wight. 



Yet eight years have scarcely elapsed since it seemed per- 

 fectly incredible that so southern a species should occur 

 amongst us. The notion that so slight and frail an insect 

 crosses the Channel on the wing is deemed incredible 

 by many ; yet, looking at the vast proportion of the 

 recent additions to our 3Iacro~Le])i(Ioptera which have 

 occurred on our southern coast and in the Isle of Wight, 

 I am disposed to fancy that there are more cases of im- 

 migration than is generally supposed. But an immigrant 

 may become a settler in the case of an insect as truly as in 

 the case of the Romans, Saxons, Danes, an(f Normans; and 

 one of the female specimens of Sacrarla taken this season 

 laid after her capture only a vei-y few eggs; so that probably 

 the greater proportion of them had already been deposited, 

 and will thus tend to continue the species in the neighhour- 

 hood of Worthing. 



The appearance and disappearance of insects— the restric- 

 tion of some to such very confined localities, whilst others 

 closely allied are of general distribution— are subjects of 

 extreme interest to the philosophical student of Entomology. 



One more paragraph and I must conclude this chapter. 



In the preceding pages I have referred only to the notices 

 of the species that have appeared in the pages of former 

 volumes of the "Annual." Thus, to take a conspicuous 

 example in No. 8, Clostera ariacJioreta, no allusion is made 

 to the extraordinary number of specimens bred by Dr. 

 Knaggs by continuing to breed from the insect year after 

 year; and again, in No. 85, Gelechia arundinetellaj the 

 species appears to stand upon a single specimen, whereas I 

 have myself bred more than one specimen of the perfect 



