1 8 Bolton, ''Mark Stirmp" Collection of Fossil Insects. 



veins may form part of the cubitus, but this cannot be deter- 

 mined, as both the proximal and distal portions are missing. 

 Outside these is a small rectangular fragment of the wing 

 bearing a close series of five parallel veins, which are apparently 

 anal in character. How much of the wing is missing it is diffi- 

 cult to conjecture. 



The right hind wing differs from the left, and is not so 

 easily understood. The sub-costal vein is much the same, as 

 its fellow of the right side. 



The radius gives off a feeble twig outwardly, and a longer 

 and more important one from its inner side, which forks. It 

 diverges obliquely from the radius. 



The radial sector arises near the base of the radius, and 

 diverges widely from it. It remains undivided for a length 

 double that of its fellow of the left wing, and then gives off 

 an outward twig which forks as it reaches the broken edge of 

 the wing. 



The median vein seems to be united to the radius at its 

 point of origin, but the wing area is partially obscured at this 

 point, and the conditions are not clearly determinable. Unlike 

 its fellow the left wing, there is no long undivided outer branch, 

 the main stem remaining undivided for some distance before 

 it gives off the first outer branch, which lies parallel to the 

 main stem of the radial sector and forks. A second outer 

 twig arises a little further out, following a course parallel to 

 the first. 



The cubitus seems to consist of two separate parts : an 

 outer stem giving off two forwardly directed veins, and three 

 which pass down tO' the inner margin. In this respect it does 

 not differ much from the cubitus of the left wing. Lying, 

 however, inwards to the main stem just described, are a series 

 of long veins which may have been given off from an inner 

 division of the main stem of the cubitus, although proximally 

 the two are somewhat widely separated now. This separation 

 may be due to the same cause which has broken away the anal 

 area, and folded two forked veins underneath the hinder branch 

 of the cubitus. If our interpretation of the cubitus be correct, 

 it must have occupied the greater part of the inner half of the 

 wing, and have occupied a greater area than the radius and 

 median veins combined. 



The intercalary venation consists of a fine reticulated mesh- 

 work, similar to that of the tegmina. The hind wing frag- 

 ments are 30 mm. long, and 20 mm. wide. 



Affinities. — Brongniart figured a somewhat similar form 

 under the name of Etoblattina sp. (Brong. Insectes Fossiles 

 des Temps Primaires, pi. XLVII (31), Fig. 4, 1893), and still 

 more recently M. Pruvost has recorded wings of a similar type 

 from the neighbourhood of Lens in the North of France. 

 (P. Pruvost, " Les Insectes Houillers du Nord de la France," 

 Annales de la Societe Geol. du Nord T. XLL, p. 323, igi2. 



