

Vol. 67.] FROM THE SOUTH WALES COALFIELD. 163 



The hinder oblique ridge follows the course of the second anal, the 

 first anal vein bounding its anterior border. Its hinder border is 

 not defined, the convexity dying out gradually over the anal area. 

 A median and less evident ridge carries the middle portion of the 

 cubitus, and lies a little in advance of the other two. The whole 

 surface is covered with a close-set series of narrow wrinkles at right 

 angles to the veins. They are most evident over the anal area, 

 where many of them fork between the veins, and also pass directly 

 over the latter in places. They are least evident over the sub-costal 

 and radial areas. 



Affinities. — In the strongly arcuate outer margin and almost 

 straight inner margin, the specimen agrees with Anthracoblattina 

 spectabilis of Goldf uss. The sub-costal vein is not, however, parallel 

 to the anterior margin, while its width at the base is more than a 

 third that of the wing, whereas in A. spectabilis it is but a quarter. 

 The radius forks much nearer the base, being subdivided practically 

 into two main divisions. The cubitus is comparatively simple, 

 and only the lower branch is forked, whereas in A. spectabilis this 

 vein forks twice, and the succeeding three branches also fork. 

 A. spectabilis is a much larger wing, having a length of 44 mm., 

 its estimated length when complete being 54 mm., and a breadth of 

 22 mm., the present species being about 33 mm. in total length as 

 now shown, but when perfect probably about 40 mm. When 

 compared with Archimylacris ( Etoblattina) venusta mihi. it exhibits 

 an equally close correspondence in shape, and in the origin of the 

 veins near the middle of the wing. Considerable differences exist, 

 however, in the sub-costal area, that of A. venusta being the longest ; 

 the branches of the radius in the latter are sixteen or more in 

 number, in the South Wales specimen there are not more than ten 

 or eleven, and the latter reach the wing-margin very obliquely. 

 The cubitus is a much longer vein in A. venusta, reaching the hinder 

 part of the apical border, while in this specimen it runs out to the 

 inner margin, the apical area being entirely occupied by the radial 

 and median areas. A careful comparison with other species shows 

 a greater divergence in structure, and I therefore regard this as 

 a form closely allied to A. venusta, but with decided specific 

 differences. The powerful muscular ridges at the base of the wing, 

 the marked convexity of the outer margin, and its upwardly reflexed 

 edge are characters peculiar to the species, and mark it off from all 

 other species that I have seen. 



Owing to its general spear-shaped form, I have applied to the 

 specimen the name of Archimylacris (Etoblattina) hastata. 



Horizon.— Gellideg Level of the Mynyddislwyn Vein, near 

 Maes-y-cwmmer (Monmouthshire). 



Archimylacris sp. indet. (PI. X, fig. 3.) [Beg. No. 24503.] 



A fragmentary blattoid tegmen showing the middle third of the 

 alar area, the proximal portion being concealed under a Cordaites 

 leaf, and the outer third missing. 



m2 



