Vol. 67. J PROM THE SOUTH WALES COALFIELD. 153 



the broken edge. The course of these vein-fragments indicates that 

 the marginal area of the median was confined to the apex of the wing. 



The cubitus is a strong vein. Four backwardly directed branches 

 are distinguishable, beyond which the main stem continues outwards 

 in an almost straight line. The branches have the same obliquity 

 to the margin, but in a direction opposite to those of the scapula. 

 A raised line some distance out from the base, at its lower end 

 touching the pronotum, may represent a basal branch of the 

 cubitus or may lie in the anal area. It is doubtful whether it 

 can belong to the anal area, as its course is perfectly straight and 

 fairly parallel to the branches of the cubitus. I am inclined to 

 regard it as a basal branch of the cubitus, and to think that its 

 present position is due to fracture of the wing, and subsequent 

 displacement. 



It is impossible to form any idea of the length or breadth of 

 the wing, so little is preserved, the total length of the fragment 

 being only 10 millimetres. This fragment has been broken along 

 the line of the median vein, and a portion of the wing is missing. 

 I have already alluded to a possible displaced portion of the cubitus. 

 The wing-surface was destitute of wrinkles, and the interspaces 

 between the veins slightly convex (concave in the cast). 



Affinities. — The general characters of the branching of the 

 veins, and the strap-shaped sub-costal area are, I think, sufficient 

 to justify the classification of the specimen with Archimylacris. 

 Specific determination of so small a fragment is impossible. 



Horizon. — Mynyddislwyn Vein, Gellideg Level, near Maes-y- 

 cwmmer (Monmouthshire). 



Associated with the impression of the fragmentary wing No. 24508 

 is a pronotum wholly unlike that of any blattoid known to me. It 

 is in actual contact with the base of the impression, and lies with 

 the dorsal side uppermost. It consists of a raised axial division, 

 convex from side to side, and narrowest anteriorly. It appears 

 to swell out backwards, assuming a somewhat pyriform shape. 

 The sides are plate-like expansions, semilunar in outline, and with 

 a very slightly convex dorsal surface, the convexity being greatest 

 over the inner concave portion of the plate, and dying out on the 

 free margin. The front portion of the axial division has been 

 broken away, and there is nothing to indicate whether a rostral 

 prolongation was present or not. The hinder central portion is 

 also missing, and rising up out of the stony matrix filling the gap 

 are the edges of two coriaceous body-segments. The central axial 

 portion of the plate is black, while the lateral expansions have the 

 colour of the matrix. Both sides preserve traces of the superficial 

 texture, the left side being far the best in that respect. The 

 surface is finely wrinkled longitudinally, the wrinkles gathering 

 strength and becoming crowded together at the inner angles of the 

 lateral plates. At the base of the left side are a few very small 

 areas of a rich ochre colour spotted with black. The inner lower 

 angle of the left side is rounded inwards, suggesting that the 



