6 5S ae Ae aed 
The conformity and likenefs which prevails between the male and 
female throughout the greater part of the animal fyftem, cannot how- 
ever in Infeéts be implicitly depended on; the difference in many is 
fuch as even to miflead fome very accurate Entomologifts, the - 
illuftrious Linnzus 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 ‘igure is of the male. 
Albin, (Plate 25, Subje# $7,) 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 or cold; as the author’s fubjeét was pre- 
ferved from the feverity of winter, ina warm room. The ufual time 
to find them in the caterpillar flate is Auguft, and in April the Fly. 
The fingular provifion which nature makes for the proteftion of 
this Fly deferves particular notice; when the time of its continuation 
in the caterpillar ftate is expired, by much labour it 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, 
exaétly reprefenting a cap, and excludes almoft 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 perfeé& infeé&.—Our 
figure reprefents the chryfalis or aurelia in the bag; part appears torn 
away to exhibit its fituation therein. 
Were we to unjte the feveral accounts of authors refpe€ting 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 
