Contents of the “Flax-seed,” Chrysalis-case, or 
Pnparinm. 
As the attack had passed into the flax-seed state 
before it was reported, I had no opportunity of observing 
the maggot whilst it was still active and in feeding 
condition; therefore, in order to keep the British 
observations clearly distinct from those of other countries, 
the description and figure of the maggot taken from 
Dr. Packard’s paper on the Hessian Fly is appended in 
a note.* I had, however, the opportunity, by careful 
dissection of a newly-formed “ flax-seed,” of making 
out some of the points of the structure of the larva. 
On opening the brown case I found the legless maggot 
within still unchanged as to development; it was bluntly 
oval, with the head retracted, and it was of a white 
milky colour, excepting at the divisions of the segments 
and also along the central line from one extremity to 
the other, which were all of a greyer tint. This 
appearance is stated by Dr. Wagner to be the beginning 
of the development of the adipose body, which “ is dis¬ 
tinguishable as snow-white masses from the remainder 
of the more transparent body.”! Beneath the maggot, 
close to the head-end, was the chitinous appendage, 
which is known in America as the “ breast-bone ” of 
Cecidomyideous larvae, with us as the “ anchor-process.” 
* “ The egg is very minute, about the fiftieth of an inch long, cylin¬ 
drical, pointed at each end, the shell shining and transparent, the egg 
being of a pale red colour when the embryo is nearly 
developed.” 
“ The larva .—After remaining about four days in 
the egg-state the larva or maggot of the Hessian Fly 
hatches, and is of the form represented. The body 
is soft, smooth, shining, oval, cylindrical, beneath a 
little flattened, and consists of twelve segments 
besides the head, the latter soft, fleshy, and but little 
separated from the body, with very rudimentary 
mouth-parts.”—Hessian Fly Report of Department 
of Agriculture, 1880 - 82, p. 208, previously cited. 
The above figures of egg and larva are copied from 
the same. The larva, when fairly advanced in growth, is stated by Dr. 
Wagner to be white or yellowish white, transparent at the sides. 
f Dr. Wagner on the Hessian Fly, Appendix I. Third Report of 
United States Entomological Commission, 1880. 
R+P 
No. 3.—Egg and mag¬ 
got of Hessian Fly, 
nat. size and mag. 
