S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 113 



G-erablattina fascigera. PI. 6, figs. 1, 2. 



Blattina fascigera Scudd., Proc. Bost. soc. nat. hist., xrx, 238-39; — lb., Entom. notes, 



vi, 35-30. 



Fore wing. Tbe wing is broad and nearly equal, the humeral lobe full, the costal 

 margin very gently and very regularly convex, the inner margin nearly straight until the 

 apical third of the wing, where it is roundly bent and thus narrows the well-rounded apex ; 

 the veins originate below the middle of the wing, and all but the mediastinal and the anal 

 veins from a single root considerably below the middle, from whence they curve rather 

 strongly upward. The mediastinal vein is very faintly preserved, and runs subparallel to 

 the costal border, with a similar arcuation, to the middle of the apical half of the wing, 

 and then curves toward it and meets it at the extremity of the fragment, or beyond the 

 middle of the apical fourth of the wing ; ' it emits a very great number of closely crowded 

 branches, which are only visible in the apical half of the area, nowhere visible throughout 

 their length, both their bases and even the principal vein itself being obliterated, and the 

 course of the vein only indicated by the position of their outer extremities ; enough 

 remains to show that they are generally simple (in a single instance a fork is seen), straight 

 or faintly arcuate, the convexity away from the costal margin and oblique, the apical ones 

 becoming slightly longitudinal ; in the middle of the wing the area occupies somewhat less 

 than one-fourth the breadth of the wing. The common stem from which arise the scapular, 

 externomedian, and internomedian veins and the anal furrow, runs in a straight line 

 parallel to the nearly obliterated mediastinal vein until just past the middle line of the 

 wing, at about the middle of the basal third of the wing, when they all divide simul- 

 taneously, excepting the two lower, which do not separate at once from each other. Be- 

 yond this common point of departure, the scapular vein is at first gently arcuate, shortly 

 afterwards, after its first branch, nearly straight, running throughout parallel to the costal 

 margin, but at a wide distance from the mediastinal vein, and terminates at the tip of the 

 wing ; it is, however, slightly arcuate, in an opposite sense to its first arcuation, between 

 each pair of branches, the main stem and each branch appearing, almost equally, as forks 

 of the preceding part of the main stem; these branches are four in number; the first 

 differs from the rest; it parts from the main stem a little beyond the basal third of the 

 wing, soon becomes nearly longitudinal, but gradually approaches the mediastinal vein, 

 and finally forks, the two branches of the fork closely resembling branches of the medias- 

 tinal vein ; the second branch of the scapular vein arises a little beyond the middle of the 

 wing, the fourth midway between this and the apex, and the third midway between the 

 two; the second is doubly, the third simply forked, and the fourth simple; the apical 

 shoots of these branches strike the margin of the scapular area at increasingly wider inter- 

 vals, the lower interspaces being similar in width to those of the inner margin. The exter- 

 nomedian vein, beyond the point of common origin, 2 runs in a nearly straight but faintly 

 wavy course nearly along the middle of the wing, parallel to the preceding, and has similar 

 arborescent but inferior branches, also emitted at irregular intervals ; the first, which is 

 doubly forked, is emitted at the centre of the wing; the second and third, which are sim- 



1 The mark separating the mediastinal and scapular areas - Represented on the plate a little incorrectly, as it should 



is placed a little too far toward the apex in the plate. be united at its base with the scapular vein. 



MEMOIRS BOST. SOC. NAT. HIST. VOL. III. 15 



