78 HISTORY OF INSECTS. 



Class VI. HEMIPTERA ; in which the perfect insect has 

 four wings, a portion of the first pair often being lea- 

 thery : the mouth is a tubular sucker, formed for ex- 

 tracting the sap of plants. Plant-bugs and plant-lice 

 are the examples. 



4. By passing through no uniform state, 



ANISOMORPHA ; 



In which the Amorphous, Necromorphous, and Isomor- 

 phous characters appear, together with others not possessed 

 by those groups. This group contains but one class of in- 

 sects. 



Class VII. NEUROPTERA; in which the perfect insect 

 has four reticulated wings. Dragon-flies are exam- 

 ples, as are also the white ants at p. 57. 



The first or Amorphous group, is again divisible into 

 two minor groups, dependant on the circumstance of 

 throwing off or retaining the prior skin when in the quies- 

 cent state ; those which throw off this skin, as butterflies 

 and moths, exhibit the eyes, antennae, legs and wings of 

 the future insect, and such a chrysalis is called pupa ader- 

 mala : those which retain the prior skin, as flies, exhibit 

 no trace of the situation of the limbs, and such a chrysalis 

 is called pupa dermata. 



The insects of the last section, possessing, as they cer- 

 tainly do, the extreme character of the Amorpha, neverthe- 

 less, as has previously been stated, testify a very evident 

 approach to the neighbouring Necromorpha ; for when the 

 skin or covering of the quiescent insect is broken, a per- 

 fectly Necromorphous form is disclosed ; and thus, though 

 nothing could appear more different than the exterior ap- 

 pearance of the two, yet this examination proves that the 



