1782. NORFOLK. 



it appears to me equally probable that the 132, 

 latter broods lie in the chryfalis flate through 

 the winter ; and that fuch as efcape deftruc- 

 tion from birds, infects, and the uncertainty 

 of feafons in this climate, rife in the fly-flate 

 the enfuing fpring. Further, it feems probable, 

 that in the more northern climates, where the 

 fummer is fhort, the entire brood lie in the 

 chryfalis-ftate through winter; which being 

 rigid, and the fpring ufually fetting in ab- 

 ruptly, the chryfalifes are locked up free from 

 injury, and the flies at once rife upon the 

 wing ; forming thofe cloud-like flights, 

 which, when the wind happens to blow a fuffi- 

 cient length of time invariably from the north- 

 eafl, have been feen to arrive, or which may 

 with every degree of probability be brought, 

 upon the eaftern coaft of this ifland. 



It is, I believe, known that Tenthredos in 

 general are gregarious ; hanging together in 

 flights : from repeated obfervations I know 

 that the fpecies under confideration will live 

 from five to ten days without food. The 

 diftancc from the fouthern cape of Norway 

 to the coaft of Norfolk is not five hundred 

 miles. It has been calculated that a balloon 

 has been carried, by the wind alone , at the rate 

 A a 3 of 



