74 S. II. SCUDDER ON PALAEOZOIC COCKROACHES. 



border is not continuous, so that its contour cannot be certainly determined, but it appears 

 to be gently convex. The veins start from some distance above the middle of the wing, 

 and curve upward considerably before assuming a longitudinal course. The mediastinal 

 vein continues subparallel to the front border, and terminates scarcely before the middle of 

 the apical half of the wing, emitting seven or eight very oblique, usually forked branches; 

 the area is narrow, scarcely occupying one-fourth the breadth of the wing. The scapular 

 vein has a sinuous course, diverging slightly from the costal margin and from the medi- 

 astinal vein in the basal half of its course, afterwards converging and terminating barely 

 before the tip of the wing; 1 it commences to divide far before the middle ol the wing, and 

 anterior to several branches of the mediastinal vein; its branches are numerous (seven or 

 more)- and simple or forked, having in this respect as in direction, although not at all in 

 length, a resemblance to the mediastinal branches; the mediastinal area occupies two-fifths 

 the breadth of the wing. The externomedian vein beyond its basal curve is nearly 

 straight, and terminates at some distance before the end of the inner border, so that the 

 area occupies rather broadly the lower outer angle of the wing; the vein commences to 

 branch a little beyond the middle of the wing, and emits three or four simple or com- 

 pound branches, which, like those of the preceding areas, are pretty closely crowded. 

 The internomedian vein follows closely the course of the externomedian, so that the area 

 narrows regularly and rather rapidly, the vein emits six or seven simple or simply forked 

 branches, which are pretty straight, oblique, and more distant than those of the other 

 areas. The anal furrow is well impressed, strongly arcuate, and terminates near the 

 end of the basal third of the wing, while the anal veins are subparallel to it. simple, 

 and rather closely crowded. 



This gracefully formed wing might well stand as the type of this group of fossil cock- 

 roaches; it is of medium size, the length of tin' fragment being 20 mm. ; the probable 

 length of the wing is 22.5 mm., and its breadth is 8.75 mm.; or the breadth to the length 



as 1:2.57. 



The pronotal shield attached to the wings has a parabolic outline, the hind border, 

 however, strongly convex; the broadest part is scarcely in front of the middle of the 

 posterior half, where the breadth equals the length; in front of this it tapers rapidly. 

 Length, 9.5 mm. 



The wing has much the same shape as Elohl. mantidioides, from which it differs in its 

 larger size, the greater length of the mediastinal area, and the distribution of the branches 

 of the scapular and externomedian veins. It also approaches the American Etobl. venusia, 

 which is larger than it. but agrees better in the mediastinal area, and to a large extent in 

 the branches of the scapular vein; in Etobl. venusta, however, this first divides still 

 further toward the base of the wing; and the branches of the externomedian vein are also 

 simple in the American species and compound in the European. From Etobl. didyma it 

 differs by its very much smaller size, the narrowness of the mediastinal area, and the distri- 

 bution of the externomedian branches. 



Germar described the species from seven individuals from Wettin, Germany. Upper 

 carboniferous. Geinitz mentions a specimen from Weissig, Saxony. Lower Dyas. (But 

 as no description or figure is given, this may be looked upon as dubious.) 



Acridites carbonaria, referred by some authors to Blattina, appears to lie a Neuropteron. 



i'Thc area of iliis vein is represented on our plate as probably too eontracted, throwing the extremity of the vein 

 broader than it should !»'. ami tin' restored outline is also ai the extreme tip of the wing. 



