Animals. 227 



which have all four wings each, covered 

 with a mealy substance of various colours, 

 which easily rubs off; and when examin- 

 ed by the microscope, appears to be ele- 

 gant scales. These insects have a pecu- 

 liar method of propagation ; they are ovi- 

 parous : and when first hatched from the 

 egg, are perfect caterpillars, which often 

 shed their skins ; and after having dives- 

 ted themselves of their skins for the last 

 time, assume new coverings called chrys- 

 alides, in which state they continue till 

 they come forth in their perfect winged 

 forms. 



The fourth division include those wing- 

 ed insects which originate from Worms, 

 and not from Caterpillars like the for- 

 mer, though they undergo similar trans- 

 formations. Some of these are furnished 

 with two, and others with four wings 

 each. The wings of animals of this class 

 differ from those of the Moth and But- 

 terfly kind, in being destitute of those 

 scales with which these are furnished. 

 This class includes all the numerous 

 class of Flies, Gnats, Beetles, &c. 



The fifth and last class of insects, con- 

 tain those which naturalists have termed 



