196 AXEL LEONARD MELANDER 



It also dichotomizes irregularly and often. Internomedian and 

 anal veins much reduced. Cross-veins numerous, forming a 

 more or less complete reticulation. 



21. Protodictyonpulchripenne sp.nov. (Plate VI, Fig, 7 ; Plate VII, Fig. 17). 



Head not indicated. Prothorax large, square, the sides 

 biarcuately sinuate, meso- and metathorax transversely quadrate, 

 narrower than the prothorax ; abdomen robust, nine segments 

 visible, the eighth and ninth with a short median keel. Beyond 

 the abdomen are well-preserved indications of two long setiform 

 appendages. Legs vaguely represented, but apparently quite 

 long. The beauty of this specimen, however, lies in the excel- 

 lent preservation of the wing-neuration, which is clearer cut 

 than in any fossil of its kind yet discovered. Every vein, branch, 

 and cross-nervure is as clearly depicted as in the living insect. 

 Wings full, large as compared with the length of the insect, costal 

 margin nearly straight : mediastinal, scapular, internomedian, 

 and anal areas much reduced ; externomedian and scapular 

 veins prominent, occupying the larger part of the wing ; medias- 

 tinal vein subparallel with the margin, ending in it considerably 

 beyond the middle of the wing. Main scapular stem nearly 

 straight, prominent, gradually converging with the margin and 

 ending three cross-veins beyond the tip of the mediastinal; near 

 the basal fifth the scapular sends down a widely diverging 

 branch, which then continues toward the wing tip, anastomosing 

 in numeroug zig-zag branches with the cross-veins. The exter- 

 nomedian vein is likewise strong, lying contiguous with the 

 scapular branch on its basal portion. Two-thirds of the way 

 toward the scapular branch it suddenly is deflected downward 

 and branches at this point; both branches furcate repeatedly, the 

 lower also connected with the hind margin of the wing by several 

 off-shoots. Internomedian and anal veins poorly developed, 

 occupying the much-reduced anal angle. All the veins con- 

 nected by rather distant, more or less irregularly disposed cross- 

 veins, which form a conspicuous reticulum with the broken 

 nervures. Fore and hind wings nearly similar, the hind ones 

 slightly broader. 



Length without head 25""', size of wing about 40°"° by lo™"". 



