194 AXEL LEONARD MELANDER 



the wing; scapular vein forked before the middle of the wing, 

 the upper branch parallel with the costal margin, emitting a sim- 

 ple under branch, the lower branch simple or simply forked, 

 nearly straight, rather distant from the upper and apically par- 

 allel with it. Externomedian vein simple, terminating near the 

 tip of the wing. Internomedian forked at the middle of the 

 wing, each branch simply forked near the tip. The main stem 

 of the anal vein is more or less parallel with the hind margin, 

 terminates in the margin at the beginning of the apical sixth of 

 the wing, and sends a number of lower branches to the hind 

 margin, which are simple or simplv forked. Neuration of the 

 hind wings nearly similar ; the mediastinal is strong and deeply 

 set in the explanate costal portion ; scapular vein more impor- 

 tant than in the fore wings, the divarication of its principal 

 branches occupying a large part of the wing and filling the apical 

 portion ; remaining veins much reduced. Both wings filled with 

 numerous cross-veins. 



Body indefinitely preserved, but indicating a slender, Coryda- 

 /w-like insect. Prothorax rounded in front, its sides parallel 

 behind ; mesothorax broader, quadrate ; metathorax and abdo- 

 men vague, their segmentation scarcely visible. Wings surpass- 

 ing the abdomen, their hind margins touching above the abdomen, 

 but the wings do not overlap. Neuration of both pairs well 

 preserved in large part. The femora of all the legs are in part 

 indicated, and show that they were provided with prominent lon- 

 gitudinal ridges. 



Length about 62™'", length of thorax (pro-) 8, (meso-) 7, 

 and (meta-) 7™"°, length of abdomen 31""°, length of front wings 

 45°"", breadth of front wings 15"™. 



The assignment of this species to the genus Dieconeura is quite 

 permissible on account of the similarity between the wing-neura- 

 tion of the different species. But it must be remembered that 

 the new form is considerably the largest that has been placed 

 here. The dissimilarity between the two pairs of wings, which 

 is shown in the somewhat diagrammatic reconstruction, is rather 

 striking for an insect of pre-Tertiary times. The interpretation of 

 the neuration is quite likely the correct one, as large portions of 

 the veins of both wings are well indicated on the fossil. 



