Vol. 67.] FROM THE SOUTH WALES COALFIELD. 159 



into two equal branches which curve gradually backwards to the 

 inner border. On the inner side of the main stem, and dis- 

 connected from it, is a branch giving off a single long vein 

 from the level of the second bifurcation of the radius, and a little 

 farther out dividing into two equal branches. All three veins 

 follow the same general curve of the ultimate branches of the main 

 stem of the radius, and run out on to the inner margin. Basally, 

 their course is such that we should expect the axis to merge into 

 the main stem of the media, and I naturally assume that they 

 are a part of that vein. Strong presumptive evidence of such 

 a union is also afforded by the basal course of the next marginal 

 veins, which appear to be separated by an interval that widens 

 basally. The median area thus marked out is very small, and does 

 not occupy more than a fifth of the inner wing-margin. 



The cubitus is represented by six marginal veins, of which only 

 the penultimate one to the apex is forked. Their basal direction 

 points conclusively to a common origin ; probably, however, only a 

 little over half of the whole vein is present. There is no trace of 

 the anal portion of the wing. 



The wing is thick, coriaceous in texture, and was somewhat 

 rounded on the upper surface. This roundness has been modified 

 in the lower half of the wing by a little crumpling from before 

 backwards. It is, perhaps, to the same shrinkage that we must 

 assign the transverse wrinkles present between the veins over 

 the radial and median areas. Unlike the purely transverse 

 wrinkles, so evident a feature in many of the Archimylacridse, 

 those in the specimen here described are oblique to the veins, and 

 not at right angles. Where they are most conspicuous, as 

 in the marginal veins of the radius, they are seen to be very 

 irregular in character. In some places, a close-set series start 

 out from the side of a vein, and die out in the interspace. In 

 other places, sets of wrinkles are interrupted by smooth inter- 

 spaces, this arrangement occurring at haphazard. There are a 

 few, but not many, cases where the wrinkles anastomose. 



Affinities. — There can be no doubt as to this specimen being 

 an Archimylacrid. Dr. Handlirsch, who has raised Arcliimylacris 

 to the dignity of a family, Archimylacridse, has also in the same 

 paper x founded a new genus, Schizoblatta, and with the type- 

 species of this genus the specimen here described is in close agree- 

 ment. The points to which I attach importance are the following : — 



In both, the sub-costal area extends for a short distance beyond the middle 

 line, the veins in each case passing out obliquely to the margin. A very wide 

 interval separates the stem of the sub-co3ta from that of the radius in the 

 middle of their length, and this area is narrowed distally in each case by the 

 approach of the marginal veins. The radius is a large and much branched 

 vein, and separates into two main divisions, which fork at the same level and 

 reach to the apical point of the wing — in our specimen just beyond it. The 

 media is relatively small, while the cubitus has few branches, passing very 



1 ' Eevision of American Palseozoic Insects ' Proc. U.S. Nat. Mus. vol. xxix 

 (1906) p. 722. 



