20 BOI.TON, " Mark Stirrup " Collcctioi of Fossil bisects. 



Tegjiiiiia. — The base, and about one-quarter of the distal 

 or free end of each wmg has been lost, and the outer and inner 

 margins of the right tegmen are not defined. The portion of 

 wing present has a length of 21 mm., and a greatest breadth 

 of 14 mm. The complete tcgmina had a probable length of 

 29 mm. 



The costal margin is preserved in the left tegmen. It is 

 gently convex. The sub-costa is widely separated from the 

 costal margin, to which it sends about ten twigs, only one 

 showing forking. The costal field is strap-shaped, and the 

 sub-divisions of the sub-costa occupy the greater part of the 

 outer margin. The radius in both wnigs is a relatively unim- 

 portant vein, running parallel to the sub-costa. In the right 

 wing, the radius forks about the middle of its length, each 

 branch forking again before the broken edge of the wing is 

 reached. The radius of the left wing divides about the middle 

 of its length like its fellow, the outer branch forking again 

 twice. The median vein passes along the middle line of the 

 wing, diverging widely from the radius, and giving off two or 

 more outward branches beyond the middle of the wing. Its 

 final twigs ran out upon the apex of the wing. The cubitus 

 is a large and important vein. Following a course but little 

 divergent from the mam stem of the median, it passes down 

 to the extreme end of the inner wing margin, giving off on its 

 mner side, a series of 5 — 6 simple oblique undivided branches, 

 followed by a branch which forks twice before reaching the 

 margin. The cubitus of the left wing shows that a single 

 outwardly directed branch is also given off at a point beyond 

 the origin of the undivided inner branches. The course of this 

 was probably parallel to the outer part of the median vein. 

 The cubitus with its sub-divisions occupies the outer two-thirds 

 of the inner margin of the wing. The anal area is well defined 

 in each wing, having partially broken away along the line of 

 the anal furrow, and iDecome pressed down upon the body of 

 the insect. The anal veins are 6 — 7 in number, the fourth in 

 each wing being forked. The intercalary venation is nowhere 

 clearly marked. The pitted condition of the wirigs rather 

 indicates a reticulate venation. Traces of the venation of the 

 hind wings are present, more especially under the distal por- 

 tion of the left wing. It is, however, too fragmentary for 

 description, and the vein fragments cannot be definitely identi- 

 fied. 



Legs. — Special interest is added to the specimen by the 

 presence under the wings, of portions of the legs of the left 

 side of the body. Remains of two, or of all three legs are 

 present. The anterior leg lies under the main stem of the sub- 

 costal vein, and has resulted in that structure being elevated 

 into a ridge Lying between the fore and hind legs, are the 

 tibia-tarsus elements of the middle one. Possibly a portion 

 of the femur is present also, lying upon the basal part of the 



