Vol. 67.] PROM THE SOUTH WALES COALFIELD. 167 



a breadth of 25. Transverse wrinkling occurs over the whole 

 wing-, the wrinkles anastomosing between the veins. Although it 

 cannot be stated as a positive fact, the bases of the media and 

 cubitus appear to have had a common root, or to arise in actual 

 contact with the primary anal vein, which is much stouter than 

 either. Both the media and the cubitus are weaker veins than any 

 others of the series. The slight indication of the anterior margin 

 of the wing in the basal sub-costal area shows that that margin 

 was convex. 



Affinities. — In the general characters of the veins this spe- 

 cimen shows an agreement with Scudder's Gerablattina (Aplithoro- 

 blattina of Handlirsch), the points in common being the weakly 

 developed sub-costa, especially in its lower half, and the apparent 

 union of the bases of the radius, media, and cubitus with the first 

 anal vein. In Scudder's G. fascigera this union is clear, and con- 

 tinues along the middle line of the wing for some distance ; while 

 in the specimen here described the general structure points to a 

 common root of no great length. In the character of the surface- 

 wrinkles and a subordinate reticulation there is also agreement. 

 The veins arise a little above the middle of the wing, a feature 

 more indicative of Archimylacris, but scarcely confined to that 

 family. I consider that the wing agrees most closely with the 

 genus Gerablattina as defined by Scudder, 1 and with that section 

 which Dr. Handlirsch has erected into a new genus under the name 

 of Aphthoroblattina, 2 although the difference in development of the 

 united veins constitutes a wide difference between this species and 

 Aphthoroblattina (Gerablattina) fascigera, which Handlirsch takes 

 as the type-species of his new genus. 1 propose for this species 

 the name sulcata. 



Horizon. — Gwernau Level of the Mynyddislwyn Vein, near 

 Maes-y-cwmmer (Monmouthshire). 



Orthomylacris lajnceolata, sp. nov. (PI. X, figs. 1 & 2.) [Reg. 

 No. 24511.] 



A left wing 23 millimetres long and 10 wide, elongate-lanceolate, 

 and tapering from the outer and inner margins to the subacute 

 apex. Both margins are slightly convex, the greatest width of the 

 wing being at the distal end of the anal area. The apical portion 

 of the wing has been bent inwards, producing an irregular cross- 

 wrinkle. In its uniform tapering towards the apex, and the long 

 bluntly-pointed appearance thus produced, the wing departs from 

 the typical blattoid type, this departure being also emphasized by 

 the uniform convexity of the upper surface and. the character of 

 the chief veins, which we shall presently consider. 



1 'Palaeozoic Cockroaches' Mem. Boston Soc. Nat. Hist. vol. iii, pt. 1 

 (1879) p. 97. 



2 ' Revision of American Paleozoic Insects' Proc. U.S. Nat. Mus. vol. xxix 

 (190G) p. 719. 



