S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 107 



The wing is of medium size, being 26.5 mm. long and 11.25 mm. broad, the breadth to 

 the length being as 1 : 2.35. The wing is a right wing, viewed from above, exhibiting no 

 cross venation. 



Goldenberg described this insect as identical with Etobl. Dohrnii. and referred both to 

 Etobl. euglyptica. This species, however, differs from both of them in the greater length of 

 the mediastinal area, the later branching of the scapular vein, and the earlier branching of 

 the externomedian vein. From Etobl. euglyptica, and to a lesser degree from Etobl. Dohrnii, 

 it differs in the unusual form of the internomedian area, one of the characteristic marks of 

 this species ; while the wing is also much broader in proportion to its length than in those 

 species, and differs considerably in form from Etobl. euglyptica. The differences between 

 the other two species are stated in the proper place. The larger size, narrower mediastinal 

 area, and ovate rather than tapering form, as well as the more complicated scapular vein, 

 distinguish this species from Gerabl. Miinsteri, to which it appears to be most nearly allied. 

 In the narrowing of its mediastinal area at either extremity, in the character of the exter- 

 nomedian branches, and to a certain extent in the form of the internomedian area, it is to 

 be compared also with Gerabl. Geinitzi ; but it differs very much in the form of the wing 

 as well as in the character of the scapular vein. From the species which follow it differs to 

 such an extent in the extended production of the internomedian area, as by no means to be 

 confounded with them. 



The single specimen comes from Wettin, Germany. Upper carboniferous. 



Gerablattina Germari. PI. 3, fig. 6. 



Blattina sp. Germ., Verst. Steink. Wettin, vii, 87, tab. 31, fig. 9. 

 Blatta Germari Gieb., Ins. Vorw., 321. 



Blattina Germari Heer, Viertelj. naturf. Gesellsch. Zurich, ix, 288; — Gold., Faun, saraep. 

 foss., ii, 19. 



Fore wing. The wing is slender and tapers considerably, besides being slightly curved ; 

 the costal margin is very strongly and regularly convex, the inner margin straight or very 

 slightly concave and a little convergent with the costal border, narrowing the rounded tip 

 unusually ; the veins apparently originate near the middle line of the wing, and curve up- 

 ward a little at the base. Beyond the base the mediastinal vein runs longitudinally in a 

 straight line to the middle of the wing, at a great distance from the costal margin, which it 

 reaches at about the middle of the outer half of the margin ; this area at its broadest occu- 

 pies more than two-fifths the breadth of the wing. The scapular and externomedian veins 

 appear to run together, and in very close proximity to the mediastinal vein, as far as the mid- 

 dle of the wing, and then divide, the scapular running to the apex of the wing and dividing, so 

 that about half a dozen veins strike the costal margin. The externomedian vein, having 

 but a narrow space to expand in, appears to emit only a single forked branch or two from 

 near the middle of its free course, furnishing about five veins to the extremity of the inner 

 margin. The internomedian vein, also running so close to the mediastinal in the basal half 

 of the wing as to occupy the middle line of the wing, and crowding the middle pair of 

 principal veins together, turns toward the inner margin more slowly than does the medias- 

 tinal toward the costal border, and, having throughout a broadly arcuate course, strikes the 

 inner margin a little before the apical sixth of the wing; it emits four straight, oblique, 



