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



convex, with the exception of the inner portion of the sub-costal 

 margin, which is slightly upcurved. No definite trace can be 

 detected of an anal furrow. 



Owing to its marked elongate character and doubly convex 

 margins, I apply to this form the name of Orthomylacris lan- 

 ce ol at a. 



Horizon. — Shales associated with the Graigola Seam, Clydach 

 Merthyr Colliery, Clydach Yalley (Swansea Vale), Glamorganshire. 



Lamproptilia tentjitegminata, sp. nov. (PI. X, fig. 6.) [Keg. 

 No. 24509.] 



A right hinder wing of large size and considerable tenuity. The 

 greatest length and breadth are 29 millimetres and 7 mm. respec- 

 tively. The tenuity of the wing is so great that underlying plant- 

 remains can be seen and traced easily. A leaf of Lepidophyllum 

 majus overlies and partly conceals the base. 



The venation is at first sight of the same general type as that of 

 a blattoid tegmen ; the branching is more extensive, however, 

 and the distal expansion of the wing-surface much greater. The 

 wing appears to have been somewhat quadrangular in outline, 

 with a sinuous inner margin, and the base is much broader than in 

 the ordinary form of blattoid. The outer margin is probably repre- 

 sented by a shadowy line along the middle third of the outer wing- 

 margin, in which case it must have been fairly straight, in this 

 region bending in a well-rounded angle to the tip of the wing, and 

 the latter similarly merging in the delicate sinuous inner border. 



The sub-costal area is narrow, strap-shaped, and probably ex- 

 tended over the whole length of the outer margin. No definite 

 trace of veins can be discerned upon it. 



The radial vein divides low down near the base into two rami, 

 the outer being the smallest. The latter first divides about the 

 middle of the wing, sending off a simple branch which reached 

 the broad apical margin, and curving gently backwards as it 

 approaches the latter. Partner out, the radius sends off at 

 equal distances two more simple branches, which follow a course 

 parallel to the first. It is then continued as a small vein, which 

 bends somewhat abruptly inwards at the point of forking, and 

 approaches close to the outermost marginal vein of the inner 

 ramus. Its backward sweep is thus greater than that of the 

 other marginal veins of the same ramus, and its course must have 

 brought it out upon the margin near the middle point of the tip of 

 the wing. The inner ramus of the radius forks low down, much 

 nearer the base than the corresponding bifurcation of the outer 

 ramus, and the two branches into which it is divided fork again 

 nearly at the same level near the middle of the wing. Of the four 

 branches thus produced, the outermost remains simple to the margin, 

 the inner branches forking on a level with the second branching 



