THE WINGS OF I SOFT ERA 



137 



beginning of the last third of the length of the scapular shield; this vein 

 passes from the shield unbranched. 



The cubital trachea (Fig. 128, Cu) is first visible at the point where the 

 anal furrow and the median furrow separate, the basal part of it being 

 concealed by the dark color of that part of the scapular shield that it 

 traverses; it extends nearly parallel with the medial trachea. Between the 

 main trunk of the cubitus and the anal furrow there is a network of irregular 

 veins, but I can not discover any tracheae in them. 



In the anal area there are no distinct veins, but merely an irregular net- 

 work of cuticular thickenings. In this area, there are, in the specimen 



S^J^ 



Fig. 129. — Wings of Maslotermes danuiniensis . 



figured, two trachea} (Fig. 128, A, A), which are visible in only a part of 

 their extent, and which do not appear to bear any relation to the cuticular 

 thickenings of this area of the wing. 



In the left wing of the individual, the base of the right wing of which is 

 figured and described above, trachea R2+3 is not divided, and trachea Sc2 

 enters the vein that appears to correspond to vein Ri of the right side. 



In the fore wings of Mastotermes there is a posterior lobe of the wing 

 (Fig. 128, P); this is termed by Holmgren the postanalfield. 



Figure 129 represents the entire wings of Mastotermes darwiniensis . In 

 the case of the fore wing, there may be noted, in addition to the features 

 shown in Figure 128, the marked difference in the strength of the veins of 

 the anterior part of the wing and those of the middle portion, the presence 

 of several strong accessorv veins borne bv cubitus near the base of the wing, 



