﻿50 



ME. H. BOLTON OK SOME INSECTS 



[vol. lxxii, 



line outwards to the anterior edge of the wing-tip. The sub-costa 

 gives off a numerous series of small, irregular, and occasionally 

 forked branches, which pass forward to the anterior margin. 



The radius arises in close apposition to the sub-costa, and gradu- 

 ally diverges from it as it passes outwards. It throws of£ a lateral 

 twig on the posterior side before reaching the tip of the wing. The 

 branchings of the radius and the single main stem of the costa 

 occupy the anterior third of the wing-tip. The main stem of the 

 radial sector probably arises from the radius close to the base of 

 the latter, but this cannot be determined, owing to the absence 

 of the inner anterior angle of the wing. The two veins are close to 

 each other proximally, the radial sector keeping parallel with the 

 radius for a short distance and then curving sharply backwards at 

 the end of the first third of its length. At this point it is widely 

 forked, a forward-directed branch passing outwards parallel to 

 the radial sector, and probably forking before it reaches the 



margin of the wing-tip. The' inner branch passes obliquely 

 backwards to the inner angle of the wing-tip, giving off three 

 forward- directed twigs, the first two forking before reaching the 

 apex of the wing. 



The median vein is a powerful structure for the first half of 

 the length, beyond which it becomes attenuated. A little beyond 

 its point of origin it breaks tip into two main branches, the outer 

 one passing in a broad curve along the median diagonal of the 

 wing, and forking before it reaches the inner margin. The second 

 branch is not so powerfully developed as the first, and follows 

 a course subparallel to the latter, giving off two simple branches 

 on its inner side before reaching the middle of its length, and 

 forming a small fork near the wing-margin. The median and 

 its branches occupy the outer half of the inner wing-margin. 



The cubitus is a comparatively weak vein, consisting of two 

 main branches, the outer forking once only, and the inner forking 



