116 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



convex, the inner margin straight, and the apex well rounded, no doubt, but broken in the 

 specimen. The veins probably originate a little above the middle of the wing, and are 

 gently arcuate at their base. The mediastinal vein runs parallel to the costal margin, but 

 beyond the middle of the wing scarcely recedes from it, afterwards curving very slightly 

 upward, and striking the apical border not a great way above the tip of the wing ; it emits 

 a large number, thirteen or more, of rather frequent branches, most of which are simple (the 

 penultimate doubly forked), parallel, the earlier ones oblique, the later longitudinally oblique ; 

 the area is a little more than a fourth the width of the wing in the middle. The scapular 

 vein runs closely parallel to the mediastinal throughout its course and emits, at equal 

 distances apart, three inferior, apically forked branches, the first scarcely beyond the basal 

 third of the wing, the third somewhat before the end of the middle third of the wing, and 

 all with their forks crowded closely together into the space between the tip of the mediastinal 

 vein and the extreme apex of the wing. The externomedian vein, on the other hand, runs 

 close and parallel to the internomedian vein ; but it also has three branches, which are 

 slightly farther apart thanin the preceding, but originate almost exactly opposite them, the 

 last simple, the others compound, filling the area with veins as closely crowded as in the pre- 

 ceding area ; the branches being superior while those of the scapular area are inferior, brings 

 the branches opposed to each other in a sense the reverse of what is commonly found in 

 palaeozoic cockroaches, and gives the wing a peculiar appearance. The internomedian vein 

 is gently and decreasingly arcuate from the base outward, and is very regular, but, at the 

 origin of its last branch, takes a direction a little above its former course, the branch and the 

 apex of the vein making common forks of the preceding part of the stem ; it terminates 

 before the apical sixth of the wing, and emits eight equidistant, simple or forked, straight 

 veins, all but the last of which are oblique ; the vein originating above the middle of a 

 broad wing, and extending so far toward the tip, gives this area a great extent, making it 

 not a little remarkable that some of its basal branches, all of which are more distant than 

 the mediastinal branches, should be simple, and so very straight. The anal furrow is 

 apparently deeply impressed at base, pretty regularly and very strongly arcuate, terminat- 

 ing a little beyond the basal third of the wing ; the anal veins, nine in number, are, so far 

 as preserved, simple, straight, and closely crowded toward the inner angle, gently arcuate 

 and more distant next the anal furrow. 



The wing is a large one, the fragment measuring 34 mm. in length and 16 mm. in 

 breadth; the length of the wing can vary little from 37 mm., making the breadth to the 

 length as 1 : 2.3. It is almost completely preserved, a little of the extreme base and tip 

 only wanting. If the upper surface is exposed, the wing is from the right side ; the 

 reticulation is mostly effaced, but with a lens one may see exceedingly delicate transverse 

 wrinkles, giving the wing a shagreened appearance. 



Goldenberg compares this species with Etobl. primaeva, with which, however, at least 

 above the internomedian area, it has very little in common, and from which it differs greatly 

 in shape ; the other species of the genus agrees far better with Etobl. primaeva. This 

 species differs from Herm. lebachensis in the structure of the mediastinal area, which is here 

 almost equal, and in the distribution of the externomedian branches, which are superior 

 and not inferior. 



The single specimen was found in a bluish bituminous shale in the neighborhood of 

 Wemmetsweiler, near Saarbrucken, Germany. Upper carboniferous. 



