S. II. SCUDDER ON PALAEOZOIC COCKROACHES. 77 



area, that its length along the inner margin is only a little longer than its longest basal 

 branch. The anal furrow is strongly impressed and its basal two-thirds very strongly 

 arcuate, while the apical third is straight, terminating some distance before the middle of 

 the wing; the anal field, notwithstanding its unusual length, is almost as broad, and is filled 

 with about eight arcuate, moderately distant veins, most of which are simple, those nearest 

 the furrow subparallel to it, the others curved in an opposite direction. 



The wing is peculiar for the prominence of the lower basal angle, which in nearly right- 

 angled, and for the corresponding extent of the anal area; it is of medium size, measuring 

 25 mm. in length and 10.5 mm. in breadth, the breadth being to the length as 1 : 2.38. 

 Only a single specimen is mentioned as having been found, which is perfect but for the 

 obliteration of parts of one or two veins at the tip of the internomedian area. 



Goldenberg compares this species to Etdbl. carbonaria, remarking that it agrees best 

 with it in size and shape, but must be considered specifically distinct on account of the 

 peculiar venation of all the areas, and especially of the combined scapular and externo- 

 median areas (Mittelfeld), which has nearly double as many branches as in Etdbl. car- 

 bonaria ; he also mentions the peculiar branching of the externomedian vein by which the 

 vein, beyond its last fork, runs free to the margin, parallel to an offshoot from the last branch 

 of the same vein ; and also the shoulder at the base of the wing, which is wrinkled and 

 projects as a sharp angle. Although certainly very closely allied to the species mentioned, 

 Etobl. russoma differs further from it in the less frequent forking of the mediastinal veins, 

 in the earlier division of the scapular and externomedian veins, the doubly forking basal 

 branch of the former, the greater irregularity in the branching of the latter, and in the 

 much more rapid narrowing of the internomedian field. It also differs a little in its greater 

 size, but it is not true that the combined scapular and externomedian areas have nearly 

 double as many branches as in Etobl. carbonaria ; the broken tip of the latter will not 

 allow us to determine just how man}' there are, but there is room for additional branches 

 in the broken portion, and those actually visible are eighteen, against twenty-five at the 

 very margin of Etobl. russoma ; or if we take each vein separately, we find in the nearly 

 perfect scapular vein of Etobl. carbonaria eleven branches, against twelve in Etobl. rus- 

 soma ; in the externomedian vein of the former, which is certainly very imperfect, seven 

 veins, against thirteen in the latter — a difference which is nearly double, but which is 

 unquestionably due, in part at least, to the imperfect state of the only known fragment of 

 Etobl. carbonaria. From Etobl. didyma, Etobl. russoma differs in nearly all the points 

 by which it may be distinguished from Etobl. carbonaria. and, besides, differs consider- 

 ably from it by its smaller size and less symmetrical shape, and the more frequent division 

 of the scapular and lower externomedian branches. From Etobl. leptophlebica it differs 

 in its broader and rounder form, and the much smaller extent of the scapular and interno- 

 median areas, as well as in the fuller expansion of the externomedian area. 



A single specimen was found at Lobejiin, Germany. Upper carboniferous. 



Etoblattina leptophlebica. PI. 3, fig. 9. 



Blattina leptophlebica Gold., Neues Jahrb. f. Mineral., 1869, 158-59, taf. 3, figs. 1% 1 A ; — 



lb., Faun, saraep. foss., ii, 19. 



The front wing is long and slender, tapering, and straight; the costal margin is very 

 gently convex, the inner margin straight, but the tip of the only specimen is broken. 



