90 



INTRODUCTION TO 



the larvae. The following figures afford examples < 

 these different kinds of pupae, the numerals refer 

 to the order in which they have just been named. 



On examining the interior of a pupa immediately 

 or shortly after it is formed, it is found to consist al 

 most entirely of a milky fluid, which soon, however 

 acquires the consistency of pulp, when the members 

 of the future insect can be detected. They are not 

 long in enlarging by the absorption of the ambient 

 matter, and when they acquire their full size, they 

 completely fill, in most instances, the interior of the 

 pupa-case. The integument, as above intimated, 

 varies greatly in its consistency. In the Lepidoptera 

 it acquires its rigidity from a viscous fluid, which 

 oozes out from the region of the thorax, and spreads 

 over the whole surface, forming a hard and varnished 

 shell. The superficies is for the most part naked. 

 In some cases, however, it is tufted with hairs, (as 

 in Orgyia pudibunda, Leucoma Salicis;} occasionally 



