Cecidomyia destructor in Great Britain. * 



of the abdomen, on to the general development of brown 

 tints of the abdomen, in which the difference of appear- 

 ance of the black velvety spots on the sides of these 

 segments disappear, and the black transverse bands are 

 not very noticeably different in colour. The antennae 

 and tarsi, and all points that it was possible for me to 

 examine, precisely corresponded with those of C. 

 destructor, — I do not say with the description of this or 

 that observer, as in a case of this enormous importance 

 I examined into the points of all the best descriptions, 

 and, where the points were not clear, tabulated the 

 descriptions in parallel columns that 1 might be abso- 

 lutely certain. The only point in which I found a 

 marking not recorded in the descriptions 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 a small line on each side of 

 it, which marking was placed in somewhat darker or 

 greyer tint than the yellowish colour of the 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 

 corresponded with that of C. destructor in all points in 

 which I was able to make comparison, because I did not 

 feel that 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. E. 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 accpuainted with the characteristics 

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

 this 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 minute 

 points of the neuration of the wings, the imago which I 

 developed from the British puparia precisely agreed 

 with the description to be gathered by collation of the 

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

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

 such of the chief European writers as I have cpioted 

 above or had the opportunity of consulting. 



