HEMIPTERA. 



The Order Hemiptera is the last great group with simple metamorphosis 

 and the first group to deviate from the simple type of mouth structure. 

 The great majority of the species have a metamorphosis as simple as that of 

 the Orthoptera but among scale insects and white flies the nymph is so 



Fig'ure 223. Stag-es in the growth of the cottony cushion scale. 



modified that the change to adult condition seems to be as great as in the 

 higher groups with complex metamorphosis and with an intermediate stage 

 resembling a pupa but which is supposed to differ from a true pupa by 



