( 9 ) 



Contents of the "Flax-seed," Chrysalis -case, or 

 Puparium. 



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."t 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-part8."-Hessian Fly Eeport of Department 

 of Agriculture, 1880 - 82, p. 208, previously cited. nat. size and mag. 



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. 



t Dr. Wagner on the Hessian Fly, Appendix I. Third Report of 

 United States Entomological Commission, 1880. 



