Obfervations on the Hejfian Fly, 35 



to froft during the whole winjier. In the year eighty-feven, 

 this transformation began about the fixteenth of April, 

 and ended about the firll of May ; and this I believe may 

 be confidered as the ufual time of its commencement and 

 continuance on the eallern parts of Long-Ifland, and 

 perhaps on thofe parts of the continent which are adjacent. 

 The fly difengages itfelf from the wheat by boring a fmall round 

 hole through the brown cafe in which it is enclofed, and 

 through the leaf of the wheat juft oppofite to the place where 

 it is lodged, and this hole may be eafily difcovered as long as 

 the flub ble remains entire. Whjenever the fly, has been hatched 

 in the houfe, it has always come forth from its brown cafe, 

 wrapt in a thin white fl^in, which it foon breaks and is then at 

 liberty, and there is every reafon to fuppofe that the fame effect 

 is produced in the field. The fly, very foon after it comes out, 

 is prepared to fpread itfelf in the field where it has lain during 

 the winter, or to take its flight to more diftant places in fearcli 

 of wheat on which to lay its eggs or maggots ; and it is at this 

 time that it has an opportunity of going on to fummer wheat, 

 which would otherwife efcape without being injured. The 

 great variety in the time of its firft coming out, produces the 

 like variety in the time of its depofiting the maggot on the 

 wheat, out this I fuppofe may be generally placed between the 

 spth of April and the 10th of May; but this period of time, 

 like the former, mufl neceflarily be regulated, with refpe6t to 

 its commencement and continuance, by the feafon j and may 



