12 THE ENTOMOLOGIST. 



points of all the best descriptions, and where the points were not 

 clear tabulated the descriptions in parallel columns that I might 

 be absolutely certain. The only point in which I found a 

 marking not recorded in the desci'iptions is, that when I placed 

 the specimen upright, so as to have a view of the upper part of 

 the abdomen, I observed a minute marking, like a V, with two 

 small lines, one on each side of it, which marking was placed in 

 somewhat darker or greyer tint than the yellowish colour of 

 these segments on a portion of the 7th and 8th segments of the 

 abdomen. This slight marking, it is unnecessary to say, is not 

 material to specific differentiation. 



Above I have mentioned that I found the imago correspond 

 with that of the C. destructor " in all the points in which I was 

 able to make comparison," because I did not feel I could be 

 certain of the presence or non-presence of the lamellae at the 

 extremity of the ovipositor, which are important points in 

 identification. I therefore forwarded the same specimen to 

 Mr. R. H. Meade, of Manningham, Bradford, who was good 

 enough to examine into the matter, and ascertain clearly that the 

 lamellulce were not present. 



To those who are acquainted with the characteristics of 

 C. destructor, it will be of interest to know that in tjiis point, in 

 the pediculated joints of the antennae, in the terminal joint of the 

 antennae of the female being half as long again as the penultimate, 

 and in the minute points of the neuration of the wings, the 

 imago which I developed from the British puparia precisely 

 agreed with the description of C. destructor, to be gathered by 

 collation, of the points of structure, as well as colour given, by 

 the entomological writers of U.S.A., Canada, and such of the 

 chief European writers as I have quoted above, or had the 

 opportunit}' of consulting. 



Once again, with regard to confirmation, I may be permitted 

 to say that, after minute investigation, I was favoured b}' Mr. R. 

 H. Meade with the distinct statement: — "I have no doubt 

 whatever about your insect being the true 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 my 

 whole series of specimens to Mr. John Marten, of Albion, 



