110 S. FT. SCTJDDER ON PALAEOZOIC COCKROACHES. 



Goklenberg as straight, and no inferior branches are preserved ; a simple superior branch, 

 running parallel to the main stem, is represented as arising at the end of the middle third 

 of the wing. 1 



The wing is a large one, the length of the fragment being 33 mm. ; its breadth, 10 mm. ; 

 the probable length of the wing, 35 mm. ; its breadth, perhaps 12.5 mm. ; making the 

 breadth to the length as 1 : 2.8. Goklenberg gives the probable breadth as 15 nun., and 

 the breadth to the length as 1 : 2.4, and this breadth is represented by the dotted lines on 

 our plate, where Goldenberg is followed. The straightness, however, and the slight 

 obliquity of the internomedian vein, render it probable that the interno median area was a 

 narrow one, more as appears in Oerabl. balteata, for instance, and the longitudinal direction 

 of all the veins and all the branches render it all the more probable ; for longitudinal 

 branches in the internomedian area are generally correlated with a narrow area; there is 

 no reticulation in the interspaces, and the wing, if the upper surface is exposed, is of the 

 left side. 



The extreme base, the whole of the anal area, all of the internomedian area below the 

 main vein, the neuration of the apical third of the wing, and the lower half of the margin 

 of the entire wing are destroyed ; enough, however, remains to indicate both the generic 

 and specific alliances of the insect, and to show that it is certainly distinct from any other 

 described form. Goldenberg's first reference of the insect as a form of Etobl. euglyptica was 

 natural, from the general resemblance of the neuration to what is found in that insect; but 

 the much greater length of the mediastinal area, not to mention the more apical division of 

 the scapular vein, at once forbids such a reference. In the form of the wing and in the 

 general distribution of the veins it most nearly resembles, perhaps, the American Gerabl. 

 balteata, but the far more apical division of the scapular and externomedian veins, and 

 especially of the former, separates it at once. In these points it is more closely allied to 

 Gerabl. Mahri, but the wing cannot be so slender as there, nor so large, and the medias- 

 tinal area is much shorter. 



Goldenberg considers this species allied to Etobl. euglyptica and Bl. latinervis on account 

 of the uncommon breadth of the veins, and to the liassic Lecjnopliora Girardl on account 

 of the smoothness of the margin, which the veins do not quite reach. 



The single specimen comes from Bracken, Canton Waldmohr, in the Kheinpflatz. Upper 

 carboniferous. 



Gerablattina balteata, nnv. sp. PI. 6, figs. 9, 10. 



Blattina sp. Font.-White, Upp. carb. flora W. Va., pi. 22, fig. 16, 16 a [hied.]. 



Fore wing. The form of the wing cannot be definitely stated, as a large part of both 

 base and apex are wanting ; the costal margin, however, is moderately and regularly convex, 

 and the inner margin nearly straight, and parallel to the former, indicating a moderately 

 slender wing of a somewhat ovate shape, tapering at either end. and largest near the mid- 

 dle. The veins are arcuate at the base, and probably originate near the middle of the 

 wing. The mediastinal vein runs subparallel to the costal margin, but is straight to just 

 beyond the middle of the wing, when it curves gradually toward the costal margin, and 



1 Two are incorrectly represented on our plate, following Goldenberg's first representation of the same. 



