affecting the Corn- Crops. 1 55 
To destroy this species moio the fields when the perfect insects 
hatch. 
The cat-crops in Stgria and Carinthia were similarly attacked 
for several successive years. 
The mischief was at last arrested by mowing the infested oats 
whilst the larvae were in them. 
Possibly feeding off the wheat with sheep might save the crops 
from I he Hessian jiy. 
Collecting and burning the stubble would destroy the larva? and 
pupae of this insect. 
KoUar recommends the German farmers to abstain from wheat- 
sowing for a year after the midges have been abundant. 
EXPLANATION OF PLATE M. 
Fig. 1. Larva or Maggot of Cephus pygmccus. 
Fig. 2.* The same magnified, in a different position. 
Fig. 3. Pupa or C/irysolis of Cephus pygmcEUS. 
Fig. 4.* The same magnified. 
a The operculum formed of excrement, &c. 
Fig. 5.* Cephus pygtnceus, the female. 
b The natural size. 
Fig. 6.* Pachymerus calcitrator, the female. 
c The natural size. 
Fig. 7. Cecidomyia tritici, the female British wheat-midge. 
Fig. 8.* The same magnified. 
r The ovipositor. 
s* Three joints of the female antenna. 
t* Six of the basal joints of a male ditto. 
u* Hinder tarsus or foot of the wheat-midge. 
Fig. 9.* Represents the germen or young grain of wheat nearly com- 
plete, with two of the valvules which enclose it. 
Fig. 10.* Is a flowtr expanded from the same ear, showing the effects 
of the little larvce which had taken up their residence 
in the corolla. 
d* The germen scarcely at all Swelled. 
e* The stamina of their usual size. 
/* The styles ditto. 
Fig. 11. Represents a grain of wheat with the chaflF and valvules 
opened. 
g The larva of Cecidomyia tritici. 
h The red-rust, at first taken for excrement. 
Fig. 12. The larva removed. 
i* The same magnified. 
Fig. 13.* One of the larva; from the group in fig. 10 greatly magnified. 
Fig. 14.* A newly-hatched /arm adhering to the lower end of one of 
the anthers; vide fig. 10 e. 
Fig. 15.* A group of the granules magnified. 
k* One of tliem highly magnified. 
