1899.] DIAMOND-BACK MOTH AND CORN SAWFLY 147 



August 5, 1897. 



I am greatly obliged to you for your very interesting and 

 valuable observations, and for the accompanying specimens 

 of corn attacks. What a collection to find in one field ! I 

 do not remember having had wheat attacked by Chlorops 

 before, though it is subject to the attack, and it is years 

 since I have had the Sawfly attack. In one stem the grub 

 had spun itself a beautiful case just within the lowest part of 

 the stem, and being kept steady in the transparent covering, 

 it gave me an excellent opportunity of examining it. 



I am very glad also of your definite observation of pre- 

 sence of Diamond-back moth. I should not much wonder 

 if we saw more of it next year, for I have just had a very 

 few specimens sent from widely distant localities. 



i, 2, Corn sawfly, magnified, and line showing natural length ; 

 3, infested stem ; 4, 5, maggot, natural size and magnified ; 6, 

 parasite fly, Pachymerus calcitrator, magnified, and 7, line showing 

 natural size. 



FIG. 31. CORN SAWFLY, CEPHUS PYGM&US, CURTIS. 



August 7, 1899. 



I am very much obliged to you for your letter of the 3rd 

 with notes of Hessian fly (fig. 15), and Corn sawfly presence. 

 I have examined the specimens, and it seems to me that 

 those of the Hessian fly attack close to the root are of the 

 same nature as some I have had before. I think your notes 

 would be interesting for my next Annual Report. I was 



