78 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



The veins originate considerably above the middle of the wing, and curve slightly upward 

 from the base before becoming longitudinal. The mediastinal vein is gently arcuate, runs 

 for a short distance parallel to the border, then curves gently toward it. and terminates at 

 about the middle of the wing; the area occupies nearly one-third the width of the wing, 

 and is filled with half a dozen forking, occasionally simple, oblique branches. The scapular 

 vein, beyond the common clustering of the veins at the base, parts rapidly from the medi- 

 astinal, and pursues a broadly arcuate course, at first divaricating slightly from the costal 

 margin and afterwards gradually approaching it, and terminates probably just before the 

 tip of the wing ; in the apical half of the wing it runs as far as the middle line of the 

 wing, making the area of unusual width; it emits about eight singly or doubly forked 

 branches (with occasionally a simple one), which are therefore long and closely crowded, and 

 assume a direction parallel to the mediastinal veins and very similar; the branching com- 

 mences in the middle of the basal half of the wing, as far back as the first division of the 

 intemomedian vein. The externomedian vein is nearly straight, but very gently and 

 broadly sinuous beyond the basal curve, and terminates probably not far before the apex, 

 leaving for the area a small marginal extent over the probably narrow apex and lower 

 outer angle of the wing; notwithstanding the slenderness of the area, the vein commences 

 to branch before the middle of the wing, and emits three or four simple or forked branches 

 (most of them probably forked near the tip, which is broken), which have a longitudinal 

 course. The intemomedian vein runs side by side with the preceding, and emits first a 

 series of comparatively distant nearly straight and simple veins, about four in number, 

 which occupy about one-half of the rather gradually narrowing area; these are followed 

 by a forked and then by a compound branch, whose forks fill the narrowing apex. The anal 

 furrow is strongly impressed, stout, strongly and very regularly arcuate, and terminates at 

 the end of the basal two-fifths of the wing; the anal veins are mostly simple, occasionally 

 feelily forked, very numerous, and very crowded, especially away from the farrow; next 

 the furrow they are rather gently arcuate, gradually becoming nearly straight or sinuous. 



The wing is peculiar among its immediate congeners for its straight and tapering slender 

 form, recalling exactly that of Etobl. affinis; it is also peculiar for the extreme breadth of 

 the scapular area, due to the deep sinuosity of the scapular vein. It is a comparatively 

 small species, the wing being probably only 19.5 mm. long (the fragment preserved meas- 

 ures 16.5 mm.), and is 7 mm. broad in the middle ; or the breadth is to the length nearly 

 as 1 : 2.S. To judge from Goldenberg's figures (he makes no mention of the fact), the 

 base of the mediastinal area is obscurely striate longitudinally, and the rest of the wing, 

 or at least around the anal furrow, very minutely and very obscurely reticulate, with three 

 or four rows of polygonal cells in each interspace. 



This species cannot be confounded with any other, for it is widely separated from all 

 with which from its size and form it might be compared, by the broad scapular area, whose 

 long branches simulate the distribution of those in the unusually short mediastinal area ; 

 it is most nearly allied to Etobl. russoma, where the general distribution of the branches 

 in the much smaller scapular area is similar, as is also the early branching of this vein 

 and the externomedian; but the form of the wing, the short mediastinal area, and the 

 much narrower and more gently tapering intemomedian area of Etobl. leplophlebica at 

 once distinguishes it from Etobl. russoma. It was compared by Goldenberg to Etobl 

 anaglyptica, on account of the form of the wing, but besides differing considerably in the 



