12 Bolton, ''Mark Shmip" Collection of Fossil lusecls. 



and traces of its hinder border can be seen across the anal area 

 of the left tegmen. 



The Tegniina. — Of the two tegmina, the left is the most 

 perfect, and has a length of 28 mm. The right tegmen has 

 a length of 32 mm. The total length of the whole tegmen 

 in each case is about 37 millimetres. The left tegmen is selected 

 for detailed description. The costal margin is gently convex, 

 and passes imperceptibly into the apex of the wing. The sub- 

 costal vein is widely separated from the costal margin at its 

 ba.se, and follows an oblique course outwards. Two-thirds of 

 the costal margin are occupied by the sub-divisions of the sub- 

 costal vein. These sub-cli visions arc few in number (6-7), the 

 first four dividing into three twigs, whilst the hfth and sixth 

 are single. 



The radius divides at the first fourth of its length into 

 two equal veins. The outer branch gives off a forward twig, 

 which divides twice by forking into four twigs, which reach 

 the margin. About the middle of the wing, a single unbranched 

 twig is given off, and two, possibly three, others further out. 



The inner branch gives off two long unbranched twigs, 

 which })ass almost straight outwards to the wing apex. The 

 divisions of the radius occupy the outer part of the wing apex. 

 The median vein arises close to the radius, diverging inwardly 

 as it passes onwards to the inner side of the middle of the wing 

 apex, giving off three forward branches, which go to the wing 

 apex parallel to the inner divisions of the radius. On its inner 

 side, the median gives off a series of hve twigs, which go down 

 to the inner wing margin. The first two fork once, whilst the 

 third crosses the fourth, uniting with the latter for a very 

 short distance, and then passing on in front of it to the margin, 

 the fifth twig divides up into four branches. 



The anal furrow is strongly marked, and portions of eight 

 anal veins are distinguishable. The anal area occupies one- 

 third of the inner wing margin, the remainder of the margin 

 being occupied by the inner divisions of the median. The ven- 

 ation of the right wing agrees in general character with that of 

 the left, but is simple and less sub-divided. The sub-costal 

 is a little more sub-divided dn the wing margin, and the radius 

 has a slightly smaller area. The median and cubitus have few 

 sub-divisions. The anal veins are better shown, and no less 

 than fourteen can be determined. The surface of the tegmina 

 is somewhat coriaceous, and at first sight presents a scaly ap- 

 pearance, owing to the well-developed intercalary venation, 

 consisting of a reticulated meshwork, which becomes transverse 

 where it crosses the divisions of the radius and median. 



Hind wings. — Clear traces are present under the tegmina. of 

 the main stem of the (?) cubital element of both hind wings, 

 and of a few of their more distal divisions, but nothing of a 

 definite character can be determined. 



