MECYNOPTERA TUBERCULATA. 37 



Generic Characters. Wing three to four times as long as broad, veins of costal 

 region specially compact, and thickened basally. Costa, subcosta and radius 

 closely approximated and tuberculated. Radial sector and median well developed, 

 and occupying a considerable portion of the wing-surface. Cubitus small. Inter- 

 stitial neuration of transverse nervures in junction areas of principal veins, and 

 with a meshwork further out. 



Mecynoptera tuberculata, sp. nov. Plate II, fig. 2 ; Text-figures 5 and 6. 

 1911. Stenodictya lobata, Baldwin (errore), Greol. Mag. [5], vol. viii, p. 75. 



Type. Portions of two fore-wings, and the cubito-anal portion of a hind-wing 

 contained in a nodule of ironstone, 3 in. long, and 1^ in. wide; British Museum 

 (no. In. 18,576). 



Horizon and Locality. Middle Coal Measures (grey-blue shales at 135 180 

 feet above the Royley or Arley Mine) ; Sparth Bottoms, Rochdale, Lancashire. 



Specific Characters. Principal veins thickened at base and finely tuberculated. 

 Costal margin almost straight, much thickened at base, and covered with a fine 



FIG. 5. 



FIG. 6. 



FIG. 5. Mecynoptera tuberculata, sp. nov. ; diagram of remains of the two fore-wings, and cubito-anal 

 portion of a hind-wing (the sub-costa appearing as a fine line close to the radius, and sending off 

 three branches to the costal margin), enlarged one-and-a-half times. Middle Coal Measures 

 (above the Royley or Arley Mine) ; Sparth Bottoms, Rochdale, Lancashire. Brit. Mus. (no 

 In. 18,576). 



FIG. 6. Mecynoptera tuberculata, sp. nov. ; diagram of fragmentary impression of the two fore-wings, 

 enlarged one-and-a-half times. Middle Coal Measures (above the Royley or Arley Mine) ; Sparth 

 Bottoms, Rochdale, Lancashire. Brit. Miis. (no. In. 18,576). 



tuberculation. Subcosta sunken, close to costa, and extending to the wing-apex. 

 Radius close to costa, tuberculated, and elevated. Radial sector arising low down, 

 much branched. Median with two main branches, the first simple, the second 

 with three twigs. Cubital vein small. 



Description. The type-specimen comprises remnants of the two fore-wings, 

 60 mm. long and 18 mm. wide, and a portion of the cubital-anal area of a single 

 hind-wing in one ironstone nodule. A similar ironstone nodule from the same 

 horizon and locality shows the radius and radial sector areas of the two wings of a 

 second insect. 



