80 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



of the veins will also distinguish it from Etdbl. anthracophila, with which it agrees in many 

 points. Goldenberg compares it to Etohl. primaeva, with which it has certain resemhlances 

 indeed by the straight ncss of the veins, and the early division of the externomedian vein, 

 but from which it differs in nearly every other point of its structure, and from which it may 

 be distinguished at a glance (to mention no other points), by having scarcely one-half the 

 breadth of the larger species. 



A single specimen from Manebach, near Ilmenau, Germany. Upper carboniferous. 



• Etoblattina elongata. PI. 2, fig. 10. 



Blattina sp. ("cf. Mahri") E. Gein., Neues Jahrb. f. Mineral., 1875, 5, taf. 1, fig. 2; — 

 lb., Neue Aufschl. Dyas v. Weiss., 5, taf. 1, fig. 2. 



The front wing is so imperfect in the only specimen known, that it is difficult to describe 

 its form; yet to judge of the apical half, which only is preserved, it is the very slenderest of 

 the species of Etoblattina, although nearly as long as the largest ; the two margins approach 

 each other gradually and equally in this apical half, making the tip exceptionally narrow, 

 although it is well rounded. Only the tip and a portion of two branches of the mediastinal 

 vein can be seen, by which we should judge that the vein was rather long, terminating only 

 a little before the apical third of the wing, and had a number of rather distant, straight, 

 oblique and simple branches. The scapular vein runs parallel to the costal margin until 

 close to the tip, when it curves toward the margin, which it strikes scarcely before the 

 extreme apex of the wing ; it begins to divide near the middle of the wing, emits half a 

 dozen straight, oblique, simple, rather distant branches, quite parallel to those of the medi- 

 astinal area, and occupies near the middle two-fifths, next the apex one-half, the width of 

 the wing. The externomedian vein divides opposite the division of the scapular vein, the 

 forks parting but slightly and again dividing (doubly) only shortly before the tip, so that 

 this vein is unusually distant from the veins on either side of it, and occupies on the mar- 

 gin a narrow area, including most of the tip and the apical portion of the inner border. 

 The internomedian vein probably changes its early course (after being directed, in the un- 

 known basal half, more obliquely toward the inner margin), for the portion in the apical 

 half is nearly longitudinal and nearly straight, curved downward toward the border very 

 slightly ; it terminates at a little distance before the tip, and emits two or three extremely 

 distant simple branches. 



Geinitz describes the surface of the wing as delicately granulate, and apparently of a 

 somewhat rigid, parchment-like consistency. The fragment, is 18.5 mm. long, and 11 mm. 

 broad; the wdiole wing was probably 35 mm. long and scarcely more than 11 mm. broad, 

 the breadth to the length being as 1 : 3.2; it is, therefore, the largest of the slender, or the 

 slenderest of the larger species, and is peculiar for its tapering apex. In the straightness 

 of its veins it resembles the preceding species as well as Etohl. Dolirnii, but is abundantly 

 distinct from either by its slenderer form. The only other species which has such a taper- 

 ing tip is Etohl. parvula, a much smaller and less slender form. Geinitz considered it as 

 probably the apex of the wing of Gerahl. Mahri ; the infrequency of the branches indeed 

 make it resemble that species in a general way, but it is difficult to compare it with that 

 from the fact that the only specimen of Gerahl. Mahri known has lost almost the whole of 

 the tip ; but there is a single point which is indisputable, and that is the excessive length 



