266 THE WINGS OF EMBIIDINA 



The presence of accessory veins in the preanal area of the wings of 

 Clothoda and occasional occurrence of vestiges of accessory veins in other 

 genera raises a question as to the position of this order in the table of the 

 methods of specialization of the wings characteristic of the orders of insects 

 given at the close of Chapter VI, and upon which the linear arrangement of 

 the orders adopted in this essay is based. 



In spite of the presence of accessory veins in the preanal area of the 

 wings in the cases mentioned, it is evident that the characteristic method of 

 specialization of the wings in this order is by reduction; even in Clothoda 

 the number of the wing-veins is greatly reduced, the radial sector being 

 only three-branched and the media reduced to an unbranched condition. 



