G8 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



distant, simple, curving branches (the basal ones not represented on the plate), of which 

 the basal ones are oblique while those beyond grow more and more longitudinal. The 

 scapular vein runs very nearly parallel to the costal margin, most nearly approaching it 

 where it first divides, a little beyond the end of the basal third of the wing, and then, 

 passing in an arcuate course opposed to the curve of the costal margin, reaches the latter 

 just before the apex of the wing ; it emits about four branches, the terminal one sim- 

 ple, the others forked and the second even trebly, the general direction of all being less 

 longitudinal than the apical branches of the mediastinal vein ; at the widest the scapular 

 area is two-fifths the breadth of the wing. Beyond the basal curve the externomedian 

 vein is straight until it divides, at some distance be}'ond the middle of the wing, and up 

 to this point it is unusually distant from the scapular vein on the one side and the inter- 

 nomedian on the other ; at its division, that is, at the origin of its first branch, it turns 

 abruptly but slightly downward, and runs subparallel to the apical portion of the costal 

 border ; its first branch is doubly forked, the offshoots inferior and thrown off 

 at nearly equal distances from the origin to the tip of the branch ; the two 

 other branches of this vein are simple, longitudinal and nearly straight, the last 

 arising before the end of the middle third of the wing, and the middle one mid- 

 way between the first and third ; all together occupy the entiie tip of the wing ; 

 the origin of the middle branch being incorrectly given in our plate, a cor- 

 rected figure of the apical half of the internomedian vein is here inserted. 

 The internomedian vein is straight from a little bej'ond its separation from 

 the anal to its last branch, and is thence feebly arcuate in a slightly more 

 longitudinal course, terminating a little farther from the tip than the scapular 

 vein ; it emits four simple or forked, very distant, slightly arcuate branches ; 

 Etoblattina j n the specimen upon which the description is based, the two middle branches 

 are simple, the others forked. The anal furrow is very distinct, especially on 

 the basal half, rather strongly and pretty uniformly arcuate, terminating at the basal 

 two-fifths of the wing ; the anal veins are numerous, being six or seven in number, and 

 generally forked, often very deeply, and excepting the extreme short ones, are gently 

 arcuate in the same sense as the furrow. 



The wing is of medium size, being 25 mm. long, and 9 mm. broad, or the length to the 

 breadth as 1 : 2.78. 



It appears to present the under surface of a left wing, as the anal furrow is in relief. 

 The principal veins and branches are also in delicate relief and distinct, excepting the anal 

 veins. The surface of the wing is glistening and, excepting on the apical third, flat ; 

 toward the apex, and especially on the apical fifth, the interspaces are broadly furrowed, 

 leaving the veins in sharp relief. In this part of the wing also, and indeed over nearly the 

 whole surface, but less distinctly than here, the interspaces are broken by a delicate 

 tracery of minute, irregular, pentagonal or rhomboidal cells, changing toward the base 

 to a series of closely approximate, obscure, transverse lines, at right angles to the neigh- 

 boring veins, and often forking feebly. 



In the extent and distribution of the branches of the scapular and externomedian veins, 

 as well as somewhat in the form of the wing, this species resembles £7o&/. iceissigeiisis, but it 

 differs very much from it in the nature of the mediastinal vein, besides being a much larger 

 insect. It agrees best with Etobl. Dohrnil in size and in the general limitation of the 



