244 THE CANADIAN ENTOMOLOGIST. 



Mr. Kellicott stated that all Cecidomyids turn in their burrows 

 throughout their lives, those with strong breast bone turning about quite 

 freely. 



Mr. Webster stated that he had observed thin, almost transparent, 

 empty cases projecting from the apexes of the galls, and also found them 

 in the bottom of the breeding jar. These he took to be the cases of the 

 pupae, and similar to those observed in connection with the wheat midge. 

 Their presence, in this case, implied that enclosed in these the insect 

 made its way out of the coarctate larval skin, and to the outside of the 

 gall, before the imago emerged. He also stated that it would be interest- 

 ing to verify the statements of Mr. Enock as to the use of the breast bone 

 or anchor-process in the turning of the larva within the coarctate skin. 



As few of the members of the Club had seen Mr. Knock's paper, he 

 would make some transcripts from it which would explain his meaning : — 

 * * * " Anyone who will take the trouble to carefully examine, under the 

 microscope, the true larva (by this I mean the larva in its first or feeding 

 stage) will at once see that it does not possess any anchor-process at all ; 

 and it is not until the y?//^/ larval stage, when the larva is securely sealed 

 up within the puparium or coarctate larva, or second larval stage, that the 

 anchor-process is developed and utilized in the most wonderful manner." 

 [Knock's Life-history of Hessian Fly, Trans. Ent. Soc. Eond., 1891, Pt. 2, 

 (June) p. 336.] 



" Though my endeavours to catch a larva in the act of turning round 

 were not successful, I made some valuable observations from the con- 

 tortions of the disturbed larvae, the most important being that, by a 

 powerful contraction of the muscles attached to the lower part of the 

 anchor-process, the larva was enabled to draw the apparatus in at the base 

 until it was at right angles to the normal position ; the head, too, was 

 drawn qiiite in. so that the forked end of the anchor-process projected to 

 its fullest extent, and whilst in this naked condition it is thrust into the 

 inside walls of the coarctate larva, the muscles are relaxed, and the 

 ventral surface brought into contact with the inside ventral surface of the 

 coarctate larva. Then other muscles appear to move a portion of the 

 dorsal surface of the body downwards and round towards the bottom or 

 head-end of the coarctate larva ; the tips are then withdrawn, the base 

 contracted again, and a hold taken by the tips being driven in a little 



