AETHEOPODA. 65 



Identification Table.^ 

 A. Jaw-like mouth parts for biting. 



-B. Two pairs of wings unlike in structure. 



C. Outer wings sheath-like and meeting in a 

 straight line; under wings folding in two 

 ways, Coleoptera (Sheath-wings). 



CC. Outer wings leathery and meeting in a 

 straight ridge; under wings folding 

 lengthwise like a fan, 



Orthoptera (Straight-wings). 

 BB. Two pairs of wings alike in structure. 



C. With very many " nerves " in the wings, 



Neuroptera (Nerve-wings). 

 CC. With few " nerves " in the wings, 



Hymenoptera (Membrane-wings). 

 AA. Tube-like mouth parts for sucking. 

 B. Two pairs of wings. 



C. Wings covered with powdery scales, 



Lepidoptera (Scale-wings). 

 CC. Wings not covered with scales. 



D. Upper wings of uniform texture, with 

 one wing crossing the other on the 

 back, Homoptera (Similar-wings). 



DD. Wings plainly of two different textures, 

 with one wing crossing the other on 

 the back, Heteioptera (Dissimilar-wings). 

 BB. One pair of wings. Diptera (Two- wings). 



1 The classification here presented is far from complete, but will serve 

 for general practice in using identification tables. 



