66 H. A. Allen — A South Wales Coal-measure Insect. 



it, as far as the broken line in the figure, is seen on one half of the 

 shale, and a little more of the basal part on the other. The base is 

 wanting, and what remains of the basal portion has suffered much 

 injury. The length of the fragment, measured from the apex, 

 is 41 mm., and the greatest breadth of the wing, measured from 

 the costal to the posterior margin, is 13 mm. 



vn IX 



"Wing of Fouquea cambrensis, n.sp., from the Coal-measures of South Wales, x 2. 



The costal nervure (the vena marginalis of Heer), numbered I in 

 the Figure, is marginal. 



The subcostal (v. mediastina), II, is simple, and is situated about 

 midway between the costal and the anterior branch of the radius. 

 It curves gently towards the costal margin, and dies out at about 

 12 ram. from the apex of the wing. 



The radius (v. scapularis), III, is bifurcated near the base; its 

 anterior portion is simple, curves gently towards the costal margin, 

 then turns rearward, and dies out near the apex of the wing. The 

 posterior portion of the radius is situated slightly in advance of the 

 long axis of the wing, and runs nearly in a straight line towards the 

 apex. It gives off a bifurcated branch at 15 mm., a simple one at 

 10 mm., and a second simple branch at 8 mm. from the apex of the 

 wing. All these branches of the posterior portion of the radius 

 reach the posterior margin of the wing near the apex. 



The median (v. externo-media), V, is forked at a short distance 

 from the base ; the anterior branch runs parallel with the radius for 

 a distance of 6 mm., and then divides into two minor branches, 

 which reach the posterior margin by a slight curve. The posterior 

 branch of the median runs straight towards the margin, produces 

 a few branchlets, and, 9 mm. from its point of bifurcation, sends an 

 offshoot direct to the margin ; 4 mm. further the branch bifurcates. 

 All the branches of the median join the apical half of the posterior 

 margin. 



The cubitus (v. interno-media) , VII, is directed towards the middle 

 of the posterior margin until within a distance of 2 mm., where it 

 turns sharply in the direction of the apex. A simple branch is 

 given off at 5 mm. from the margin, and a few branchlets may be 

 seen running out from the main branch. 



Nearer the base faint indications of nervures occur which may 

 form the anal system {v. analis), IX, but, on account of the injured 

 condition of the wing, their origin cannot be traced. 



