168 ME. H. BOLTON ON INSECT-REMAINS [Feb. I9II, 



The sub-costal area is a little less than half of the length of 

 the outer margin, broadly triangular, and only sends six veins to 

 the margin. The sub-costa is thin, sunken, and gives off three 

 forked branches which pass out in straight oblique lines. The 

 area of the sub-costal or humeral lobe is smooth, and the outer 

 marginal edge, up to the termination of the sub- costal area, is 

 slightly upturned. The first two branches of the sub-costa arise 

 very low down. 



The radial vein has numerous branches, and its area occupies 

 the greater portion of the fore part of the wing, the most distal 

 vein reaching the margin a little short of the apical point. The 

 main stem is thin, sunken, and divided into four principal branches, 

 the first three of which are doubly forked, the last forking only 

 once. The main stem has a slight sigmoidal curve, being directed 

 forward over the first third of its length, backwards over the 

 middle third, and forward and outwards over the last branch. 

 All the veins are very oblique and arise low down ; and thus, 

 notwithstanding the narrowness of the wing, Ihey are relatively 

 long. A wide interval separates the outer branch of the sub-costa 

 from the lower innermost branch of the radius, the interval being 

 widest in the middle and narrowing at the wing-margin and at the 

 base. 



The media has the same general characters as the previously 

 described veins, but does not branch until the middle of the wing 

 is reached, and on a level with the third branching of the radius. 

 The proximal branch curves very slightly backwards and then 

 forward, forking twice, the hinder of the distal veins reaching 

 the margin in the apical point. Before doing so, it forks, then 

 reunites, the two branches enclosing a long lenticular area. Beyond 

 the union, it forks again quite close to the margin. The second 

 branch of the media is single throughout its length, and is a very 

 long vein, almost half the length of the wing. A little beyond the 

 origin of this second branch, the main stem divides into two, the 

 inner or proximal one passing out undivided to the inner margin, 

 which it reaches some little distance behind the apical point. The 

 distal branch is somewhat remarkable : branching at about half 

 the length of the proximal branch, it sends off two unequal veins. 

 Of these, the anterior is long, and bent forwards in a strong curve, 

 reaching the margin at the apical point, and but little removed 

 from the tip of the long simple vein that has been already de- 

 scribed ; the inner branch is short, and passes obliquely outwards 

 to the inner margin, leaving an unusually wide double wedge- 

 shaped area between the two branches. As a result of this curious 

 disposition of two branches having a common origin, a large section 

 of the inner apical margin is destitute of veins. 



The cubitus arises near, or may be united to, the base of the 

 media. This is a point which cannot be determined, the wing-base 

 being broken away. It at once divides into two main branches, the 



