THE AMERICAN ENTOMOLOGIST. 



no 



to nestle during the autumn and winter." 



While, then, as a general rule there are two 



broods of the fly, the first laying their eggs 



late in April and in May, and the second 



flies again issue forth, and the cycle of 

 changes for the year is complete." Thus 

 we see that the flies are ready for work in 

 the Fall, much before the wheat is ready 



[Fig. 46. 



Hessian Flv : a, egg ; b^ larva ; c^ flaxseed stage or puparium ; d^ pupa ; e, female fly, natural 

 size, laying her eggs ; /", side view of 2 ; ^, side view of (5 ; /«, the swollen stem where the flaxseeds 

 remain ; z, back view of the parasite, Semiotellus destructor Say (after Packard). 



appearing late in August, during Septem- 

 ber, and perhaps a few early in October, 

 Prof. Cook, who observed the fly in Michi- 

 gan, says that "in July and August the 



for them, and may attack a volunteer crop 

 long before the usual crop is above ground, 

 or even sown. 



A third brood tnay sometimes appear, as 



