Vol. 67.] FROil THE SOUTH WALES COALFIELD. 157 



inclined to regard the single vein shown next to the radius, as the 

 basal end of a comparatively small media. This vein-stem shows 

 a bifurcation at the end of the middle third of its visible length,, 

 and a second bifurcation on the outer branch near the broken edge 

 of the wing. It is difficult to determine whether the next inner 

 long simple vein belongs to the media or not. It approaches the 

 base of the media very closely indeed, but, as I believe, does not 

 fuse with it. The crumpling of the wing at the critical point 

 prevents positive determination either way. 



The next inner vein is a part or the whole of the cubitus. I 

 interpret it as the lower or inner division, regarding the long vein 

 previously noted as the outer branch of the cubitus. The inner 

 division consists of a stem gently arcuated, and bifurcating twice r 

 ending on the middle third of the inner margin in four branches. 

 The anal furrow follows a course parallel to the inner branch of 

 the cubitus. The wing has broken along the course of the furrow, 

 and thus obscured its characters somewhat. It can be determined, 

 however, that the furrow is shallow and the vein thin. The anal 

 area is crossed by three small veins arising from one basal point, 

 and radiating outwards to the margin. Owing to the fracture, the 

 anal area has become a little displaced inwards. 



Affinities. — Owing to the fragmentary and crumpled condition 

 of the wing, the affinities are by no means easy of determination. 

 By far the most important features determinable are the almost 

 equal sub-costal and anal areas, the restriction of the radial area to* 

 the outer half of the wing-apex, and the corresponding expansion 

 of the median veins over the inner half. The few anal veins dis- 

 tinguishable seem to radiate from one point. All these are features 

 characteristic of the family Mylacridas of Scudder. The generic 

 relationships are clearly those of Handlirsch's genus Hemimylaeris^ 

 and the correspondence with the lower half of that author's 

 Hemimylaeris ramificata is remarkably close. Differences there 

 are, but of specific value only. I may instance the few anal 

 veins in the South Wales fragment, and the clear suggestion of an 

 almost straight inner margin. Careful comparison with the 

 characters of Etoblattina, Gerablattina, and Archimylacris have 

 satisfied me that it can be none of these, and I therefore place the 

 specimen in the genus Hemimylaeris of Handlirsch. 



Although the full characters of the wing cannot be determined, 

 it seems desirable to give the species a name, as it is clearly not 

 H. ramificata. I assign to it, therefore, the name of Hemi- 

 mylaeris convexa. 



Horizon. — Shales associated with the Graigola Seam. Clydach 

 Merthyr Colliery, Clydach Valley (Swansea Vale), Glamorganshire. 



Aechimylacris (Schizoblatta) obovata, sp. nov. (PL VII, figs. 4-6.) 

 [Keg. Nos. 24506 & 24507.] 



A markedly obovate left tegmen, the portion preserved being 

 23 millimetres in length, and 10 mm. in greatest breadth. The 



