Vol. 67.] FROM THE SOUTH WALES COALFIELD. 171 



of the radius. The course of the veins is irregular, the interspaces 

 widening and narrowing along their length. This may be due to 

 distortion of the wing when deposited upon the mud. The marginal 

 veins arising from the radius extend over the whole inner portion 

 of the wing-tip, owing to their strong backward course in the final 

 portion of their length, the direction being almost at right angles 

 to the basal portion of the stem-vein. 



The media divides almost at its point of origin, the outer branch 

 forking a little below the middle of the wing, beyond which the 

 veins become so attenuated that their course is but faintly outlined 

 to the distal end of the inner margin. The inner vein forks low 

 down, and again in the middle of the wing, the resultant four 

 branch-veins thinning out much as do those of the outer branch. 

 They are impressed as very faint lines, the continuity of which 

 cannot be traced back to the inner margin. 



The course of the cubitus is obscured by a reed-like plant which 

 underlies it. It is much less distinct than the rest, only two basal 

 portions being distinguishable. 



The anal area is filled by a broad series of thread-like veins, 

 which sweep outwards and backwards in a fan-like form to the 

 inner margin, and occupy fully one-half of it. The innermost 

 anal veins are quite geniculated close to their origin, so that 

 they bend abruptly backwards. They all seem to arise from a 

 comparatively few (four to six) stems. 



The inner margin of the wing to a third of its total depth is 

 quite filmy and veil-like, the veins crossing the area as faint 

 shadowy lines. The outer two-thirds is more strongly impressed,, 

 while indications are present which lead to the inference that in 

 the broad base of attachment the stem-veins were more than 

 usually robust. No trace of transverse veins, of wrinkles, or of a 

 reticulation is shown. 



The specimen lies in a small fragile block of brown mudstone or 

 shale, crowded with plant-remains, among which I have distin- 

 guished LepidophyUum majus and Cordaites. 



Affinities. — Hind wings of insects are so rarely found in the 

 Coal Measures, that generic or specific determination is a matter of 

 no small difficulty. Unless found in association with the tegmina, 

 it may well happen that they may be referred to a different genus. 

 Dr. Sellards, 1 who devotes more than usual attention to blattoid hind 

 wings and also figures several, says that they did not fold longi- 

 tudinally as in recent forms, and that cross-veins are not known. 

 The inner border was full and well rounded, making the wing 

 broad in proportion to its length. Dr. Sellards's types may best be 

 described as broadly ovate, and much unlike the form here described. 

 They are indeed but little removed from the tegmina in shape. 

 Scudder, HandHrseh, and others have hardly touched this question, 



1 ' Structure of Fossil Cockroaches ' Arner. Journ. Sci. ser. 4, vol. xviii 

 (1904) p. 119. 



