40 THE BOOK OF THE FLY 



" crustacean IN STAR (or shell-encased aurelian), which 

 " metamorphosises into the winged IMAGO (the an- 

 Vgelic ? or diabolic ? fly) ; in the contemplation of this 

 "knowledge alone is there supreme Darwinian Modern- 

 "ismal salvation and felicity." Amen. 



In view of the prosaic illustration of transmutation, 

 figure 5 above, the futurist disciple will have to accept 

 the seventeenness of segmentation by something like 

 faith without sight. 



The quadrangularity of the crustacean stage is based 

 upon the idea that the wings bud out from the two 

 upper corners, whilst the legs develop from the lower 

 corners of the transmuting instar. 



Perchance the reader will desire information about 

 the use of this curious word " instar," which has not the 

 honour of notice in Dr. Sir J. Murray's New English 

 Dictionary. One might well feel proud of the oppor- 

 tunity of adding the smallest item to such a stupendous 

 and monumental work, but I fear I am only qualified to 

 venture a fair guess. Virgil, I believe, used this term 

 in allusion to the legendary wooden horse of the 

 Greeks at their siege of Troy. Some time less than 

 one hundred years ago entomologists recognised that 

 the words aurelian, chrysalis, and pupa were none of 

 them an inherently fit term of general application to 

 the stage of insect life to be indicated. After many 

 attempts, this latest proposed substitute seems to be 

 gaining favour. 



The fly emerges after bursting apart the first four 

 segments of the puparium ; this it does by a curious 

 provision, whereby it can inflate a chamber in its head 

 in a queer, balloon-like fashion, making a bag-like 



