68 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



close similarity between them and Pteronepionites (' Revision der Palaozoischen 

 Insekten,' p. 76). 



"Pteronepionites" johnsoni, sp. nov. Plate IV, fig. 4; Text-figure 20. 



Type. Immature wing, 12 mm. long and 4 mm. wide; British Museum 

 (Madeley Collection, no. I. 2967). 



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

 and " Thick " coals) ; Coseley, Staffs. 



Description. The wing, like all these immature structures, is of extreme 

 tenuity, and the finer details are masked by the coarse granular nature of the 

 matrix composing the nodule. The outer margin is straight, curving backwards 

 until it meets the inner margin in a bluntly-pointed apex. The inner margin is 

 strongly convex, a distal infolding indicating that the wing was apparently never 

 fully extended. Very feeble traces occur of a short straight subcosta, which 



FIG. 20. "Pteronepionites" johnsoni, sp. nov.; diagram of wing-neuration, two-and-a-half times 

 natural size. Middle Coal Measures (binds between the "Brooch" and "Thick" coals) ; Coseley, 

 Staffordshire. Madeley Collection, Brit. Mus. (no. I. 2967). 



reached the margin near the apex of the wing. The radius is stout and straight 

 and reaches the wing-apex, giving off a well-marked radial sector, which, diverging 

 from the radius, passes in a wide curve into the wing-apex. The median remains 

 undivided for nearly a third of its length, and then bifurcates into two equal 

 branches which assume a parallel position, and reach the outer third of the inner 

 margin. The cubitus is represented by two veins, the first having a sigmoidal 

 sweep and the second a simple curve. Both reach the middle third of the inner 

 margin. No trace of anal veins can be observed. 



" Pteronepionites " ambigua, sp. nov. Plate IV, fig. 5. 



'/'///">. A pair of larval wings still attached to the crushed and almost 

 obliterated body ; British Museum (Madeley Collection, no. I. 2968). 



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

 and " Thick " coals) ; Coseley, Staffs. 



Description. The insect lies in a fragment of a light grey ironstone nodule, 

 and is not well preserved. One wing is whole, but more than half of the second 

 is missing, and its apex is obscured by the matrix. The whole wing has a length 

 of 6-5 mm. and a width of 2 mm. Each is much thickened over the basal half, 



