300 Ilandlirsch — New Paleozoic Insects from the 



by a distance equal in breadth to the radio-subcostal space, 

 with but (?)3 slightly vaulted branches, one of which (the 

 proximal) forms a terminal fork. The space occupied by the 

 sector is comparatively small. The medial vein splits near its 

 origin into 2 equivalent branches. Each of these forms a large 

 fork in about the center of the wing. All their main branches 

 run in regular arches to the border of the wing. From the 

 anterior branch of the first fork rise, moreover, 4, from that of 

 the second fork 3, S-shaped twigs, directed backward and out- 

 ward. The posterior branch of the second fork sends forth 2 

 short twigs directed forward and outward. The cubital vein 

 splits near the base into 2 main branches ; the posterior is split 



Fig. 3. 



Fig. 3. Syntonoptera schucherti. 



no further, the anterior giving origin to 3 main twigs, the fore- 

 most of these widely diverging and sending forth 4 S-shaped 

 twigs directed backward. Each of the 2 other main twigs 

 forms 3 short apical veinlets. The 2 long-vaulted anal veins, 

 directed like the branches of the cubitus to the posterior mar- 

 gin of the wing, send out 3 or 5 partly simple, partly forked 

 S-shaped branches. Of a third anal vein there is but a frag- 

 ment to be seen. 



By the peculiar distribution of the veins and by the parallel 

 position of the last radial with the first medial branch, of the 

 last medial with the first cubital branch and by the bipartition 

 of the medial vein, the surface of the wing seems to be divided 

 into 4 triangular areas almost equal in value. 



It is of great interest to see the manner in which the convex 

 and concave veins alternate in this wing. We find here a 

 proof that the position of the veins above or below merely 

 follows mechanical rules and has nothing to do with the origin 

 of the veins. The costa is convex, the subcosta concave ; the 



