P L A T E I. 7 



in manv, but fuch as entitles it to a figure in a future plate ; the want 

 of room determining us to defer it for the prefent. Our figure is that 

 of die male. 



Albin, [Plate 25, Subject 37,) has given a figure of the male and 

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

 aurelia ftate 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 aiid cold ; what the author mentions 

 was preferved from the feverity of winter, in a warm room ; the ufu.il 

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



The fuigular provision which nature makes for the protection of 

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

 in the caterpillar ftate is expired, like all others, it refufes to eat ; it 

 then, by much labour, forms a kind of bag or purfe, of a very tough 

 fubftance ; 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 briftles that unite in the center, exactly reprefenting a cap, and 

 excludes almoft the poffibility of its receiving an injury during this 

 defencelefs ftate. In this bag it pafTes to the aurelia, and remains until 

 the birth of the perfect infect. — Our figure reprefents the chryfalis or" 

 aurelia in the bag; part appears torn away to exhibit its iituation 

 therein. 



Were we to unite the feveral accounts of authors reflecting its food 

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

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



PLATE 



