596 



TEXT-BOOK OF ENTOMOLOGY 



Leach l in 1815 gave the name of Ametabola to insects without, and Metabola 

 to insects with a metamorphosis. 



FIG. 558. Partial metamorphosis of Meldttoplu* . fviinir-nibi-um, showing- the five nymph 

 stages, and the gradual growth of the wings, which are first visible externally in 3, 36, 3c. EmertOD 

 del. 



*In Samouelle's The Entomologist's Useful Compendium, 1819. See Westwood's 

 Class. Insects, i, p. 2 ; Leach's Ametabolia comprised the Thysanura (Synaptera) and 

 tho lice. 



