. 
152 TURNIP. 
There is another species of Gnat Midge, the Cecidomyia (Diplosis) 
ochracea, Winn., of which the maggots do mischief somewhat similarly 
to the above to the seeds and pods of Rape. But the Cecidomyias 
sent me were certainly not of this species, as these are of a clay-yellow 
colour, and are mentioned by Herr Schiner as turning lighter after 
death, whereas mine (as above mentioned) had turned black. 
It would be of great interest to identify this attack with certainty, 
and I should be much obliged to correspondents who, when they see 
seed-pods of Turnip, Cabbage, Rape, or Mustard becoming mis-shapen 
and bursting open, would let me have a few specimens before they 
have arrived at the bursting stage. 
There appears to be great similarity in this part of the damage 
between that caused by the Cecidomyia brassice maggots and those of 
our very well-known little Turnip Seed Weevil, Ceutorhynchus assimilis. 
This little grey weevil is found very frequently on the blossoming tops 
of Turnip, Mustard, or allied plants, doing mischief, along with the 
Meligethes, the Turnip-blossom Beetle, before the maggots begin their 
work of destruction within the formed pods. Then though, as noted 
by Mr. Sim, and mentioned also by John Curtis, some of the maggots 
may escape through a little perforation, yet they do damage wholesale 
by causing the bursting of the pod, and I should greatly like to have 
some of the still unopened pods, that I might see for myself which 
kind of maggot escaped, and perhaps be able to breed the Cecidomyia 
for identification of species. 
