44 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



with its eyes," but no definite trace of the latter are observable. The " head " is 

 small, not more than 7 mm. wide, and between 5 — <> mm. long at the sides ; 

 medially it is prolonged into the rostral process, which is about 8 — 9 mm. long 

 and ending in a sharp point. I am unable to distinguish any dividing line between 

 the " head " and the prothorax ; on the other hand, the margin of the latter is 

 continuous with and inseparable from it. The marking which AVoodward has 

 regarded as representing eyes is, I believe, the thickened margin. lam of opinion 

 that the whole structure is wholly protliorax, and that the head lies concealed 

 beneath. The main mass of the prothorax is 30 mm. wide, with a flattened margin, 

 best seen on the left side. Within the flat margins rise two low dome-shaped 

 lobes separated by ;i wide hollow in front, their margins meeting in an obtuse 

 angle posteriorly. The median edge of each lobe dips sharply into a wide median 

 hollow, and from each of these edges arises a series of veins, which spread out to 

 the lateral margins of the lobes. The areas between the veins are occupied by a 

 fine mesh work of smaller veins. 



A trace of the mesothorax is shown between the bases of the fore-wings as a 

 slight transverse bar, a small rounded tubercle lying in front and a little to the 

 left of the middle line. 



The left fore- and hind-wings are the most nearly perfect, the hind-wing being 

 56 mm. lont>- with a greatest width of 30 nun. The fore-wing is a little shorter 

 and narrower. The outer margin appears to have been straight, and the costa 

 and subcosta closely approximated. Traces of both veins are present. The radius 

 is a straight thin vein not far removed from the subcosta along its whole length, 

 and giving off the radial sector beyond the middle of the wing. The radial sector 

 comes off at an acute angle, going out to the wing-apex and keeping closely 

 parallel with the radius. The median is somewhat inconspicuous owing to the 

 great length of the main stem, and the narrow areas which bound it between the 

 radius and the prominent cubitus. It gives off two outer branches before reaching 

 the broken edge of the wing. The median vein of the hind-wing has three 

 outer branches, the first arising nearer the base than the point of origin of tin' 

 radial sector, whereas in the fore-wing the first branch arises distally to the origin 

 of the radial sector. The median of the hind-wing is a more important vein than 

 its fellow in the fore-wing and occupies a greater area owing to its greater inward 

 curvature. The cubitus is a powerful vein with widely spaced divisions, the first 

 branch, both in fore- and hind-wings, coining off from the main stem on the outer 

 side, and low down near the base of the wing, and then passing in a bold convex 

 sweep down to the distal portion of the inner margin. On its inner side the 

 cubitus gives off five branches, the fourth forking in the middle of its length. 

 The branches arise at irregular distances, and the main stem reaches the margin 

 far out towards the wing-apex. The cubitus of the hind-wing gives off a large 

 outer branch which is almost equal in strength to the main stem. This arises 



