METAMORPHOSES. 69 



cased-nj/mph, on the otlier hand definitely pointing out 

 the particular sort of pupa meant : just as in Botany, 

 the common term pericmp applies to all seed-vessels, 

 the several kinds being- designated by the names of 

 capsule, silicle, &c. 



The envelope of cased-ni/mphs^ which is formed of 

 the skin of the larva, considerably altered in form and 

 texture, may be conveniently called the pitparium^: 

 but to the artificial coverings of different kinds, whether 

 of silk, wood, or earth, &c. which many insects of the 

 other orders fabricate for themselves previously to as- 

 suming the pupa state, and which have been called by 

 different writers, pods, cods, husks, and beans, I shall 

 continue the more definite French terra cocon, angli- 

 cized into cocoon^. 



After remaining a shorter or longer period, some 

 species only a few hours, others months, others one or 

 more years, in the pupa state, the inclosed insect, now 

 become mature in all its parts, bursts the case which 

 inclosed it, quits the pupa, and enters upon the fourth 

 and last state. 



We now see it (unless it be an apterous species) 

 furnished with wings, capable of propagation, and often 

 under a form altogether different from those which it 

 has previously borne — a perfect beetle, butterfly, or 

 other insect. This Linne termed the imago state, and 

 the animal that had attained to it the imago ; because, 

 having laid aside its mash, and cast off its sicaddling 

 bands, being no longer disguised or confined, or in any 

 respect imperfect, it is now become a true representa- 

 tive or image of its species. This state is in general 



"" Plate XVII. Fig. 2. " Plate XVII. Fig. 5—10. 



