156 ME. H. BOLTON ON INSECT-REMAINS [Feb. I9II, 



branch to the margin, and then bifurcates twice, the resultant four 

 veins pursuing a course parallel to the simple members of the main 

 stem, and filling up the space between it and the anal furrow ; 

 (2) of a series of seven or eight straight veins, only three of which 

 possess a single bifurcation. Not less than fourteen anal veins 

 impinge upon the wing-margin. The base of the anal area is 

 prolonged into a short, stout, subacute pedicle, presenting all the 

 features of an articular surface. The wing, considered as a whole, 

 is leathery in texture, and there is an entire absence of cross-veins 

 or wrinkles. 



Affinities. — The essential features of this wing are its broad 

 and shortened cbaracter, the triangular sub-costal area, doubly- 

 branched radius, the backwardly directed branches of the media, 

 and the large anal area. This assemblage of characters is only to 

 be found in one family, that of the Mylacridae. The somewhat 

 radial character of some of the anal veins, the backwardly directed 

 branches of the media, and the long anal area limit the specimen 

 to the genus Hemimylacris. In this genus also the inner division 

 of the radius is much the largest, and covers most of the radial 

 area, a feature in which the specimen here described agrees. I 

 have, therefore, no hesitation in classing it as belonging to Hemi- 

 mylacris. It is a broader wing than H. ramificata, and the greater 

 humeral area is destitute of veins, while the marginal extension of 

 the cubital area is not so large, and the general course of those 

 veins more arcuate. It is, however, a closely related species, to 

 which I would give the name Hemimylacris obtusa. 



Horizon. — Four-Foot Seam of Swansea, Gladys Colliery. 1 mile 

 east-south-east of Penller-gaer Church (Glamorganshire). 



Hemimylacris convexa, sp. nov. (PI. VII, fig. 3.) [Peg. 

 No. 24512.] 



Proximal half of a tegmen, much distorted and crumpled at the 

 base. The part remaining does not exceed 10 millimetres in 

 length. The sub-costal lobe has been broken and crushed in 

 upon itself: it was apparently smooth. Very little is left of the 

 sub-costal area, which appears to have been triangular, and to 

 have run out upon the margin at about the level of the tip of the 

 anal furrow. Traces of two marginal veins are present. 



The radius arises in the middle of the base, and almost imme- 

 diately bifurcates. The outer branch divides again into two 

 marginal veins, while the inner first sends off a long simple vein, 

 then passes straight outwards in the direction of the apical point 

 of the wing, bifurcating just before the broken edge of the wing is 

 reached. While the fragmentary marginal branches of the sub- 

 costa appear curved, those of the radius are straight. The inter- 

 vening areas are flat in both cases. 



A comparatively wide interspace divides the radius from the 

 media. It is scarcely possible to separate the latter vein from the 

 cubitus with certainty, so little of the wing being present. I am 



