THE WINGS OF SALTATORIAL ORTHOPTERA 



129 



The radial trachea. — There is a great variation in the size of the main 

 trunk of the radial trachea; in Conocephalus (Fig. 122), it corresponds in 



Fig. 122. — Wings of a nymph of Conocephalus (After C. & N.). 



size with the other principal trachese; but in the fore wing of Oecanthus 

 (Fig. 124) it is the least developed of the principal veins. In all cases the 

 radial sector is greatly reduced; and in some, the radius is unbranched. 

 The medial trachea. — In most cases the medial trachea has become a 

 member of the cubito-anal group of tracheee, but in the hind wing of 

 Oecanthus (Fig. 1 24) it arises from the transverse basal trachea only a slightly 

 nearer to the cubital trachea than to the radial. The typical branching of 

 this trachea is not preserved in any of the forms studied. 



Fig. 123. — Hind wing of a nymph of Scudderia. Dotted lines indicate 

 adult venation in part (After C. & N.). 



The cubital trachea. — Great variations exist in the development of the 

 cubital trachea even within the limits of a single family. In the acridid 



