43 
arise from their coverts, sluggishly fly a few feet, and alight again, 
In other fields, where none of the flax seeds could previously be 
found, an occasional fly was met with, onthe same day. A week 
after this, on a thorough examination, no flies could be found, nor 
were but two specimens afterwards met with, until the coming out 
of the summer brood. 
Second Generation. 
After the full details that have already been given, but a few 
words will be required under this head. About the first of May 
the fly appears, and deposits its eggs upon the same crop of grain 
that has already reared one brood, and also upon any spring 
wheat that is sufficiently forward for its purposes. The radical 
leaves of the winter wheat are now more or less withered, and 
the fly therefore selects the more luxuriant leaves that have put 
forth above these. The worm hatches, and again makes its short 
journey to its future home, at the base of the sheath; it conse- 
quently now nestles at the first and second joints of the young 
stalk, and is sometimes, though rarely, as high as the third joint. 
Even before the worm reaches the base of the sheath, it has fre- 
quently grown nearly to its full size (as shown, fig. m.) The 
stalk has now attained such vigor and hardiness that it is seldom 
destroyed by this spring attack. A slight swelling, immediately 
above the joint, (fig. B. §§,) commonly indicates the presence of 
the larva beneath. This is a fact which has been overlooked, or 
at least not distinctly stated by writers hitherto. We only find it 
noticed by Mr. Bergen, (Cultivator, viii., 133,) who informs us 
that in a crop of barley which was destroyed by the Hessian fly, 
many of the stalks were “at the joints as thick as a man’s finger.” 
The insect is therefore a true gadl-fly, although when but one lar- 
va succeeds in reaching the joint, the swelling caused by it is but 
little if at all apparent. More commonly however, the straw be- 
comes so weakened, that it is unable to sustain the weight of the 
wheat head, and it accordingly bends down (as represented, fig. 
B. tt,) with the force of the wind and rains. The appearance of 
a badly infested field, as harvest time approaches, cannot better 
be described than in the words of M. KGllar. The grain looks as 
