6 Cecidomyia destructor in Great Britain. 



Once again, with regard to confirmation, I may be 

 permitted to say that, after minute examination of the 

 imago, I was favoured by Mr. R. H. Meade with the 

 distinct statement :— " I have no doubt whatever about 

 your insect being Cecidomyia destructor " ; and further 

 on in his letter, after giving me point by point the 

 results of his examination, he adds : — " I have no doubt 

 that the real Hessian Fly has made its appearance 

 here." 



Since this letter I have had the opportunity of 

 submitting 1113' whole series of specimens to Mr. John 

 Marten, of Albion, Illinois (who, whilst Dr. C. Thomas 

 was State Entomologist of Illinois, was one of his 

 assistants). As it is from the work of Dr. C. Thomas 

 that the paper on Hessian Fly, published by the Ento- 

 mological Commission of the U.S.A., is stated by Dr. 

 Packard to be mainly formed, and Mr. J. Marten 

 (Dr. Thomas's assistant) has especially devoted himself 

 to the study of this insect, his opinion is one of much 

 value. I am now able to mention from personal exami- 

 nation that in every condition, from that of slightly- 

 changed larva up to imago, which I have watched through 

 all its changes of colour, the insect under discussion cor- 

 responds with the Cecidomyia destructor of Say ; that the 

 injury to the corn-stalks also corresponds exactly; and, 

 further, that I have received confirmation on these 

 points on personal examination of my specimens from 

 the high authorities mentioned above. To this I may 

 add that the work of the later brood has also now, or up 

 to my last communication, appeared on the self-sown 

 or late-sprouted plant, as described in the States. ' 



