10 



THE ENTOMOLOGIST. 



Anchor process. 



I shall perhaps be excused in mentioning that I have devoted 

 especial attention to the stud}^ of Cecidomyideous larvae and the 

 form of the anchor process for some years ; the subject was 

 therefore one with which I was conversant. 

 The peculiar alteration in colour of the 

 larva in this early stage of partial pupation 

 was also described by Dr. Wagner, and 

 accounted for by him as the result of the 

 formation of adipose matter. In a more 

 advanced stage the colouring further changed 

 to that stated to accompany the first development of the parts of 

 the embryo imago. 



To return now from the larval contents to the puparium. 

 The form of this corresponded with the very exceptional form of 

 that of the C. destructor. It resembled a flax-seed so nearly that 

 on mixing flax-seeds and puparia together it was impossible at a 

 glance to detect the diiference. On more minute examination the 

 figures of the puparia were narrower, and, though they had the 

 flattened form of the flax-seeds, they were distinguishable by one 

 extremity having a mark across, as if it had been pinched in at 

 one end, the other being slightly bent forward. These appear- 

 ances are characteristic of the C. destructor puparia at this stage. 

 At first (as it was an early condition of 

 pupation) I did not find the longitudinal 

 striae ; the outer skin, which had changed 

 to chestnut-brown of lighter or darker tints, 

 according to its age, still preserved the 

 slight transverse markings, showing the 

 divisions of the segments in the larval 

 state. As the colour deepened the striae 

 appeared, and were clearly visible running 

 longitudinally from one extremity to the other, in the manner 

 shown in my own figure, from life, accompanying. 



As I was unwilling to rest on my own opinion in such an 

 important matter, I forwarded specimens of the infested stems to 

 our Ijife-President, and trust I shall not be out of order in giving 

 his own words. After just thanking me for details, &c., "of 

 attack of the Hessian Fly," he wrote, " There can be no doubt 

 that such is really the true ' Simon pure ' ; more's the pity." On 

 sending further specimens. Prof. Westwood wrote with regard to 



Pupa, &c. 



