" PTERONEPIONITES " LEPUS. 69 



and strongly ridged or furrowed along the line of a powerful vein or tracheal 

 trunk (the wing is so immature as to render the latter possible), occupying the 

 position of the radius and median veins. Traces of a third vein occupying the 

 position of the cubitus are present on the inner half of the wing. The body- 

 segments are numerous, 3 — 4 mm. in depth, and seem to have had pleura-like 

 expansions. The region in front of the thorax is bent backwards and below the 

 abdominal segments. The thoracic segments are larger and more robust than 

 those of the abdomen. 



The thinness of the body, and the difficulty of determining boundaries with 

 satisfactory accuracy, render all attempts at a more precise determination impos- 

 sible. We can, however, say with confidence that the remains are those of an 

 insect possessing a long segmented body, an elongated head-region, and wings 

 carried upright over the back. 



" Pteronepionites " lepus, sp. nov. Plate IV, fig. <i. 



Type.- — Remains of a larval insect, having a segmented body and two immature 

 wings, in a flattened nodule of light-grey ironstone ; British Museum (Madeley 

 Collection, no. I. 2969). 



Horizon and Locality. — Middle Coal Measures (binds between the "Brooch" 

 and " Thick " coals) ; Coseley, Staffs. 



Description. — The impression of two wings is clearly discernible, the segments 

 of the abdomen are less so. With oblique lighting, six segments can be 

 made out behind the thorax. The wings are slightly unequal in size, and the 

 anterior is longer and thicker than the posterior wing; it is also somewhat 

 infolded at the base. The differences between the two wings, and their relative 

 positions, would seem to indicate that they are the fore- and hind-wings of the 

 one side. 



The fore-wing has a length of 9 mm. and a width of 2'5 mm., while the hind- 

 wing is 8 mm. long and 2 mm. wide. The fore- wing has a strap-shaped 

 appearance, and the line of attachment to the body is its broadest part. A stout 

 ridge, swollen at its junction with the body, traverses the greater part of the 

 length of the wing, dying out before the apex is reached. The wing is too small 

 for definite determination of this swelling, but it appears due to incomplete 

 extension of the wing-membrane, rather than to the presence of a vein. The distal 

 fourth is flat and thin, and the apex well rounded. The outer and inner margins 

 are parallel and undulated. A few faint and irregular lines may be indications 

 of veins. 



The hind-wing has undergone greater expansion than the fore-wing, and lies 

 almost flat on the nodule. Both outer and inner margins are gently convex, the 

 convexity of the inner margin being the greater. Feeble traces of a subcosta, and 



