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



whole of the anal and a portion of the cubital areas are missing, 

 as also a small portion of the base. The dimensions of the perfect 

 wing are hardly likely to have exceeded 25 millimetres in total 

 length and 12 to 13 mm. in breadth. 



The anterior margin forms a broad convex curve, almost straight 

 as it approaches the base, and more rounded towards the narrowed 

 and blunt apex. Beyond the apical point the inner margin is 

 complete for half of its length, and has a well-rounded convex 

 outline, much more pronounced than that of the outer margin. 

 The sub-costal area is narrow, somewhat strap-shaped, but widest 

 in the middle, and terminating acutely a little beyond the middle 

 of the outer margin. A little of the base of the sub-costa and 

 the proximal costal lobe are absent. The former gives off three 

 veins, the basal one remaining single to the margin, the second 

 giving off a simple basal branch and then forking just before 

 reaching the margin, while the outer and final branch bifurcates 

 near the middle of its length. Traces of a more basal vein can be 

 seen, but whether it is a still lower branch (which is most probable) 

 cannot be determined. All the branches of the sub-costa pass out 

 very obliquely to the margin. The areas between the secondary 

 veins are widest in the middle, and hollowed, the veins standing 

 out in relief. 



The radius is much the largest of the series, being separated over 

 the greater part of its length by an unusually wide interval from 

 the sub-costa. At a distance of 3 millimetres from the present base 

 of the wing, it divides into two diverging branches, each of which 

 again forks at a height of 4 mm. beyond the first bifurcation. The 

 first branch sends off a long vein, which forks before reaching the 

 margin, and approaches the outer vein of the sub-costa so closely 

 as to make the interval between them about equal to that of the 

 adjacent area. The inner division of the branch sends off, forward 

 and outwards, a long vein which forks almost on the margin ; 

 passing forwards, it then forks at the level of the outer angle of 

 the sub-costal area, and runs on to the outer margin. The two 

 branches of the middle division pass out to the middle of the wing, 

 the inner branch being concave outwards. The outer branch 

 divides a little below the inner, and sends the resultant two veins 

 straight to the outer margin. The inner branch first sends a 

 simple undivided vein backwards, which reaches the margin 

 just below the apical point ; a little farther out, a simple vein is 

 directed forward in advance of the apical point of the wing. 

 The area of the radius is thus large, and as it passes beyond the 

 apical point back to the inner margin, the area of the media is 

 correspondingly reduced. 



The full character of the median vein is to some extent a 

 matter of conjecture, owing to the missing portion of the wing- 

 having carried away the basal union of the veins. A portion of 

 the main stem is visible, from the level of the second double 

 bifurcation of the radius, and is seen passing straight out towards 

 the apex, until the middle of the wing is reached, where it divides 



