108 S. H. SCTJDDER ON PALAEOZOIC COCKROACHES. 



simple or apicaUy forked branches. The anal furrow is well impressed, strongly and regu- 

 larly arcuate, and terminates near the middle of the wing ; the anal veins that can be seen 

 are simple, closely approximate, and similarly arcuate. 



This is one of the smallest species, measuring only 11.5 mm. in length by 3.75 mm. in 

 breadth, the breadth being to the length rather more than 1:3. If the upper surface is 

 exposed, it is a left wing. Germar does not describe it, believing the neuration too imper- 

 fect for determination ; but it is sufficiently preserved, to judge from his illustration (on 

 which this description is based), to determine its generic and specific relations with a reason- 

 able certitude. The form, excepting perhaps at the base, is well preserved, and this separates 

 it at once from all known species. In size it agrees only with Etobl. parvula and Etobl. 

 insignis, from which it is at once separated by the extent of the mediastinal area. The 

 mediastinal branches are obliterated, as well as the base of those of the scapular and exter- 

 nomeclian areas, but the extent of the mediastinal area, and the common distance from 

 the base at which the scapular and externomedian veins divide, show that it belongs to this 

 genus ; while by the close approximation of all the principal veins in the basal half of the 

 wing, as well as by its size and form, it is readily distinguishable from all the other species 

 of the genus. It has no very close affinities to any of the species, although perhaps nearest 

 to Gerabl. Mahri, beside which we have placed it. 



One specimen, Wettin, Germany. Upper carboniferous. 



Gerablattina Mahri. PI. 3, fig. 14. 



Blattina Mahri, Gold., in Mahr., Neues. Jahrb. f. Mineral, 1870, 284-85, fig. 2% 2 b ; —Gold. 



Faun, saraep. foss., ii, 19. 

 Compare also synonom_y of Blattina elongata. 



Fore wing very slender and somewhat tapering, the costal margin rather gently arcuate 

 on the basal third, beyond nearly straight, the inner margin, at least in the middle, straight. 

 The veins originate below the middle of the wing, and are strongly arcuate at the base. 

 The mediastinal vein follows closely the curve of the costal margin, showing no tendency to 

 approach it throughout the fragment, that is, probably, as far as the middle of the apical half 

 of the wing ; it probably terminates only just above the tip, and emits about ten straight, 

 oblique, equal, very distant, simple branches ; the area occupies nearly or quite a third of 

 the breadth of the wing in its apical half. The scapular vein is closely parallel to the medi- 

 astinal, but very distant from it, running scarcely above the middle line of the wing ; it 

 forks once in the middle of the wing, and, to judge of the openness of the neuration, prob- 

 ably not again, the two forks probably enclosing the extreme tip of the wing between 

 them. The externomedian vein is distant from the scapular vein, but not so distant as the 

 former is from the mediastinal ; beyond the base, which is lost, it is straight and longitudinal 

 nearly to the middle of the wing ; just before this it is bent rather abruptly and slightly 

 downward, and runs nearly parallel to the internomedian vein, emitting near together, 

 just beyond the middle of the wing, two superior, longitudinal, simple, straight branches. 

 The internomedian vein is very gently and uniformly arcuate, and being also as distant 

 from the externomedian as the latter from the scapular vein, the area is unusually narrow 

 and slender, the vein probably terminating a little before the middle of the apical half of 

 the wing ; it emits half a dozen nearly straiglit, oblique, mostly simple, parallel, and distant 



