PHYLOBLATTA TRANSVERSALS. 115 



anal veins, the first and second only being forked. The whole of the anal area is 

 not shown, and 3 — 4 veins may be missing. 



The interstitial nen ration consists of a close series of transverse nervures or 

 wrinkles, it is impossible to say which. They are best seen in the anal and 

 cubital areas. 



Affinities. — The union of the stems of the median and cubitus veins, the 

 occupation of the greater part of the inner half of the wing by the median, whose 

 branches take up the whole of the inner margin outside the anal area, and the 

 strong parallelism of the branches of the principal veins, are well-marked features 

 which in the main agree most, I think, with Phyloblatta. Its resemblance to 

 Gerablattina is also marked, and it is well to remember that Handlirsch has 

 referred several species originally placed in the latter genus to Phyloblatta. This 

 question of the generic relationship is a good example of the difficulty of allocating 

 species to genera whose characters are not wholly known. 



Phyloblatta transversalis, Bolton. Plate VIII, fig. 2; Text-figure 37. 



1917. Phylloblatta transversalis, Bolton, Proc. Birmingham Nat. Hist, Phil. Soc, vol. xiv, pp. 100— 

 103, pi. vii, figs. 1, 2. 



Type.— Remains of two Blattoids, consisting of the tegmina, two pronota, and 

 portions of the hind- wings, in a split nodule of ironstone, 60 mm. long, and 45 mm. 

 broad; Geological Museum, University of Birmingham. 



Horizon and Locality.- — Coal Measures; Staffordshire. 



The nodules were collected by Dr. Blake and agree in all respects with those 

 found at Tipton and Coseley. Staffordshire, in the binds between the " Brooch " 

 and " Thick " coals of the Middle Coal Measures. 



S^ieclfic Characters. — Radius relatively simple with five branches, radial sector 

 large and evenly forked ; median vein small, with three outer branches; cubitus 

 vein long with seven inward branches ; anal area small with few anal veins. 



Description. — The remains of three insects are shown on the split surfaces of 

 two small ironstone nodules. The larger nodule contains the remains of two 

 Blattoid tegmina, two pronota, and fragments of hind-wings. One tegmen is 

 almost complete, while of the other more than half is shown, the distal end having 

 been lost in splitting the nodule. 



The tegmina lie with the under surfaces uppermost, the impression of the 

 underside being preserved on the larger portion of the nodule. As both are from 

 the left side, it follows that they belong to two insects — a conclusion confirmed by 

 the presence of a pronotum in close association with each. In the case of the 

 more nearly complete tegmen, the pronotum lies a little apart, and upside down, 

 like the tegmen, while the pronotum of the more incomplete wing lies on the basal 



