122 CEAKBEEET CTJLTtlEE. 



that such was the case. On Mr. Hinckley's bog I noticed 

 numbers of these shoots that plainly showed that the in- 

 sect had commenced its work, but had been removed, as 

 the shoot kept right on. On inquiring, I found that Mr. 

 Hinckley had flowed his bog on the 26th of June. This 

 was, I think, rather late to hit most of theni, but it proba- 

 bly washed out some. 



After the insect has spun its cocoon, it is impossible 

 either to wash it out or to drown it. Recently, I placed a 

 shoot in water that contained two of these maggots ; they 

 were all I could find to experiment with. One of the 

 two washed out, the other remained. 



Probably flowing would prove more effectual when the 

 maggots are quite small, as the leaves do not close to- 

 gether very tightly until the maggot is nearly full grown. 

 I hope it will be seldom that the bogs have such a visita- 

 tion as the bog of Mr. Hinckley received. If any of the 

 members of the Association wish to see what the insects 

 can do when numerous, they had better visit this bog. 

 Had I known that they were so numerous there during 

 the early part of the summer, I should have been glad to 

 have been upon the ground, to see what results would 

 follow flowing when the maggots first commenced their 

 work. It would be a good plan to flow when the parent 

 gnat is out. Some might be bred in the house, and then 

 one would know exactly when they were out. It is usually 

 some time about the 4th of July that the gnat comes forth. 



This first brood is the most numerous, although there 

 are other broods as long as there are growing runners. I 

 found a few of these maggots in September, 1868. 



I am not aware that this insect has ever been described 

 by scientific men. I have, at different seasons, sent them 

 to some of my scientific correspondents, but I cannot 

 learn that they have published any description of it. 



It is a true Cecidomyia, closely related to the minute 

 Hessian-fly, that is so destructive at times to wheat. 



