132 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



divisions. Cubitus large, with six simple branches. Anal area very wide basally, 

 and with 46 veins. Tegmen tapering along both margins to the apex. 



Description. The tegmen lies with the under surface uppermost, lacking only 

 a small portion of the wing-apex. It is short and broad, measuring 14mm. long 

 and 8mm. wide. The dorsal surface is convex, the exposed under surface being 

 concave. 



The costal margin is rounded, especially in the basal portion of the subcostal 

 area. Distally the margin curves into the wing-apex, which is bluntly rounded. 

 The inner margin curves outwards in its distal half,, so that the wing is widest 

 basally, and narrows into the wing-apex. 



The subcosta is a strong vein with few branches, the first two being simple, 

 and passing out obliquely. A forked branch arises further out, and near the 

 margin of the wing a single simple branch. The costal area is broad basally, and 

 well rounded. 



The radius is a large, much-divided vein, occupying, with the subcosta, the 

 outer half of the wing. It is short, and gives off a radial sector in the basal 



FIG. 42. Soomylacris burri, Bolton ; diagram of venation of left tegmen, four times natural size. 

 Coal Measures (dark shale from a depth of 1208 ft.) ; Barfreston Boring, Kent. Mus, Kent Coal 

 Concessions Co., Dover. 



fourth, afterwards passing out obliquely to the outer margin, and giving off four 

 outward branches, the first irregular in its course, and with two feeble twigs 

 which do not reach the margin, the second and third forking well out, and the 

 fourth small and undivided. The radial sector passes straight to the wing-apex, 

 giving off six strong branches, the first, second, and fourth forking, the rest 

 remaining undivided. 



The median is convexly curved basally, and bent inwards to the inner margin. 

 It gives off a strong forward triple-divided branch in the basal fourth, and further 

 out a second branch, which forks three times into four branches. The eight 

 divisions of the median end on the distal third of the inner margin and part of the 

 apex. 



The cubitus describes a regular sigmoidal curve, and gives off at regular 

 intervals a series of six inwardly directed branches, all of which are undivided. 



The anal area is very wide basally, and crossed by 4 6 veins, the first forking 

 twice, the second once, the third undivided, and the fourth forked. Traces of two 



