134 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



The subcosta is thin, sunk in the tegminal structure, and gives off three forked 

 branches which pass in straight oblique lines to the margin. 



The radius is a large vein, with four branches, the first three doubly-forked 

 and the last undivided. The main stem of the radius is convex in the basal part 

 of its length, and concave in the outer half. The branches pass out very obliquely 

 and extend on to the apical margin. 



The median divides about the middle of the tegmen, on a level with the third 

 branch of the radius. It gives off three branches, the first forking twice into four 

 equal twigs, the second of the series forking again near the margin. The inner 

 pair of twigs unite in the middle of their length, and separate again further out, 

 so that a lenticular " cell " is produced. The second branch is undivided. The 

 third branch divides into a long outer twig which bends forwards towards the 

 apex, and a smaller and weaker twig which goes straight out to the inner margin. 

 There is, as a result of this separation, a wide part of the inner margin destitute 

 of veins. 



m I t 



Fig. 43. — Orthomylacris lanceolata, Bolton; diagram of venation of left tegmen, three times natural 

 size.— Coal Measures (shales associated with the Graigola Seam, Pennant Series); Clydach 

 Merthyr Colliery, Clydach Valley, Swansea Vale, Glam. Mus. Pract. Geol. (no. 24511). Number- 

 ing of veins as in Text-figure 33, p. 104. 



The cubitus arises close to the median, and at once divides into two main 

 branches, the outer being forked once only, and the inner giving off a forked 

 branch succeeded by two which are undivided. 



The anal area has broken away along the line of the anal furrow. It is shorter 

 than the subcostal area. 



The interstitial neuration cannot be determined with certainty. The surface 

 near the apex is marked by cross-wrinkles, but I cannot affirm that this is a part 

 of the neuration. 



LARVAL BLATTOIDS. 

 (Blattoidea) peachi (Woodward). Plate IX, fig. 6. 



1887. Etoblattina peachii, Woodward, Geol. Mag. [3], vol. iv, p. 433, pi. xii, fig. 1. 

 1906. (Blattoidea) jJeachii, Handlirseh, Die Foasilen Insekten, p. 178, pi. xviii, fig. 26. 



Type. — Upper surface of head, pronotum, rudimentary wings, and broad seg- 

 mented abdomen, in nodule of fine grey sandstone ; Kilmarnock Museum. 



