6 PLATE 1. 



The conformity and likenefs which prevails between the male and 

 female throughout the greater part of the animal fyftem, cannot how- 

 ever in Infeds be implicitly depended on ; the difference in many is 

 fuch as even to miflead fome very accurate Entomologifts, the 

 illuftrious Urinous not excepted. In this fpecies it is not fo great as 

 in many, but fuch as entitles the female to a figure in a future plate : 

 Our figure is of the male. 



Albin, (Plate 25, Subjecl 37,) has given a figure of the male and 

 female on the fame plate, and defcribes a male to have changed to the 

 aurelia frate as in our plate reprefented July 16, and March 18 fol- 

 lowing to have produced the Fly. But the time of their appearance de- 

 pends on the proportion of heat or cold ; as the author's fubjecl: was pre- 

 ferred from the fevcrity of winter, in a warm room. The ufual time 

 to find them in the caterpillar ftate is Auguft, and in April the Fly. 



The fingular provifion which nature makes for the protection of 

 this Fly deferves particular notice ; when the time of its continuation 

 in the caterpillar flate is expired, by much labour it forms a kind of 

 bag or purfe, of a very tough fubflance; this it fixes againft the trunks 

 of trees, &c. by a number of hairs or filaments, which remain on the 

 external furface. It lines the outer cafe by one of a finer texture, 

 the top of which is clofed by feveral bridles that unite in the center, 

 exaftly reprefenting a cap, and excludes almofl the poffibility of its 

 receiving an injury during this defencelefs flate. In this bag it paffes 

 to the aurelia, and remains until the birth of the perfeft infecL — Our 

 figure reprefents the chryfalis or aurelia in the bag ; part appears torn 

 away to exhibit its fituation therein. 



Were we to unite the feveral accounts of authors refpe&ing its food, 

 it would appear to be a general feeder ; it will live on the rofe, the 

 elm, and the willow ; and on thorns and brambles particularly. 



PLATE 



