THE WINGS OF THE I SOFTER A 



141 



/?j+j 



/?l+5 



In the hind win^^ the base of media coalesces with vein R4+5, while in 

 the fore wing it coalesces with the cubitus. 



In the hind wing much more of the anal area is preser\^ed than in the fore 

 wing. To understand this area of this wing the corresponding area of the 

 hind wing of Mastotermes 



should be studied. In tm,, ■■i.mni imn ^^^''^'^'^^''liln^^lfiWMllBflf^i Sc^ 



Termopsis the anal fturo w 

 is quite distinct (Fig. 133, 

 F), but there is no trace 

 of the first anal vein. 

 The second anal vein, 

 however, is well pre- 

 served. The basal part 

 of the anal area, that part 

 behind the anal furrow, 

 is considerably thick- 

 ened, and the second anal 

 vein appears to arise from 

 this thickened part of the 

 wing. The third anal vein is wanting, and there is no axillary furrow. 

 In comparing the hind wing of Termopsis with that of Mastotermes one 

 receives the impression that in the making of the Termopsis wing that part 

 of a primitive termite wing back of the axillary furrow was cut away. 



The thickened portion of the anal area of the hind wing that lies behind 

 the anal furrow is divided by a transverse suture which is probably the 

 beginning of a humeral suture (Fig. 133, hs). 



The tracheation and the venation of the wings of Leucotermes flavipes. 

 — In this species the venation of the wings is greatly reduced. In the 

 costo-radial part of the wing the reduction is in the number of the veins; 



Fig- 133- 



-Base of a hind wing of Termopsis 

 angiisticollis. 



Fig. 134. 



A hind wing of Leucotermes flavipes. 

 portion is shown. 



Only the detached 



but in other parts of the wing the reduction is in the amount of their 

 chitinization (Fig. 134). The wing figured is a hind \ving, which differs 

 from the fore ^ving in that media coalesces with radius at the base, while in 

 the fore wing media is free where it crosses the humeral suture. 



