86 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



inner margin is missing. So far as preserved it is 41 mm. long, and 10 nun. in 

 greatest breadth. 



The fore- wing lies on a hind-wing which is partly traceable, and both have 

 been crumpled together, some of the veins of the hind-wing showing through 

 the fore-wing. This renders the unravelling of the venation difficult, while 

 the fragmentary condition of the stems of the main veins in the basal part 

 of the wing hinders the definite determination of their course, and their relation 

 to one another. 



A small portion of the distally outer or costal margin has been uncovered 

 sufficient to show that it was slightly convex, ('lose to the margin is a trace of 

 the subcostal vein, proving that it continued well towards the wing-apex, if it did 

 not reach the latter. 



The outer part of the wing has been torn away along the area separating the 

 subcosta and radius, and the latter vein is seen to traverse the whole length of the 

 wing, but whether it joined the outer margin distally or came out on the wing- 

 apex is not discernible. 



The basal half of the radius is confused with the basal portions of the median 

 and cubitus veins, owing to the crumpling which the wing has undergone. The 

 radial sector arises in the basal half of the wing and diverges from the radius, a 

 wide area separating the two. Soon after its origin it receives a branch from the 

 median, and immediately afterwards gives off the first of three inwardly directed 

 branches, the middle one soon dividing into two equal twigs, while the first branch 

 forks on the margin. These divisions of the radius and the radial sector occupy 

 the whole of the outer part of the wing-apex. The first branch of the radial 

 sector probably represents the union of two twigs of the radius and median, and 

 the small marginal fork may also represent their separation. 



The median vein is incomplete basally, and appears to be large and much 

 divided. Apparently it separates early into two main branches, the first dividing 

 into two almost equal twigs, which again fork, the outer branch of each fork going 

 forwards as an oblique commissure and joining the vein next in front. This is a 

 somewhat unusual feature. The course of the outer twig after its juncture with 

 the stem of the radial sector Ave have already traced. The outer twig of the 

 second branch of the median, after fusing with the inner twig of the first branch, 

 is probably continued by the inner of the two later divisions formed by that twig. 

 The third branch of the median passes obliquely inwards, giving off an outer twig 

 which forks twice, and, beyond the middle of the wing, gives off outer and inner 

 branches from one point, afterwards forking twice before it reaches the inner 

 margin of the wing. The whole structure ends in fourteen divisions on the distal 

 half of the inner margin, and occupies a considerable area of the whole wing. It 

 is possible that this complex of branching veins represents the median and cubitus 

 combined, but I do not think it likely. If such be the case, the first branch given 



