THE WINGS OF SALTATORIAL ORTHOPTERA 127 



species ; in the fore wing as figured by this author the media is completely 

 typical. In the left tegmen figured here (Fig. 119) media is three branched ; 

 it appears that veins M3 and M4 coalesce to the margin of the wing, other- 

 wise the arrangement is typical. 



The cubitus bears one accessory vein in the right tegmen (Fig. 118), and 

 two in the left (Fig. 119). 



(c) THE WINGS OF THE SALTATORIAL ORTHOPTERA 



Although the discussion of the wings of the saltatorial Orthoptera is 

 here separated from that of the wings of the Blattida, for the reason given 

 on an earlier page, I am unable to point out any distinguishing characteris- 

 tic between the wings of the two groups. The only attempt that has been 

 made to do this is the statement by Handlirsch that the costa is marginal 

 in the Blattidee and distant from the margin of the wing in the saltatorial 



Fig. 120. — Hind wing of a nymph of Xiphidium (After C. & N.). 



Orthoptera; but I regard the evidence supporting this view as far from 

 being conclusive. 



The tracheation of the wings. — The development of wings of saltatorial 

 Orthoptera was studied by Comstock and Needham ; as very little has been 

 published on this subject since the appearance of our paper, the following 

 account is based on the data obtained by us jointly.* 



The basal connections of the luing trachece. — In all of the saltatorial 

 Orthoptera studied by us a transverse basal trachea was found. But in 

 the hind wing of a n^nnph of Xiphidium (Fig. 120) this trachea was greatly 

 reduced. That this trachea is vestigial and not rudimentary is evident 

 from the fact that the base of the medial trachea has completed its migra- 

 tion towards the cubito-anal group of tracheae and coalesces with the cubital 

 trachea for a short distance. The transverse basal trachea has served its 

 purpose in making possible this migration of the base of the medial trachea, 

 and, like an abandoned road, is disappearing from view. 



*Hancock ('02) has discussed the tracheation of the wings of the Tettigidae and gives 

 several figures of the wings in which the tracheae are represented. 



