104 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



unusually perfect, but probably the basal portion at the humeral lobe is wanting. It is 

 peculiar for the straightness of its costal margin as contrasted with the fullness of the 

 inner margin, for the basal narrowing of the mediastinal field, and for the extreme apical 

 simple forking of the scapular vein. In the first and last of these features it is undoubt- 

 edly allied to the preceding species, but is readily distinguished from that by its narrower 

 mediastinal field, as well as by abundant division of the externomedian vein, the smaller 

 size of the wing, and the much more crowded neuration. Gerdbl. Miinsteri has a some- 

 what similar scapular vein, and also has a crowded neuration. but it also has an extremely 

 wide mediastinal field, in striking contrast to this species : its straight costal margin also at 

 once separates this species from Gerabl. Miinsteri, as indeed from all the other unmentioned 

 species of this genus. 



The single specimen found comes from Lobejiin, Germany. Upper carboniferous. 



Gerablattina Miinsteri. PI. 2, fig. 12. 



Blattina flabellata Germ., Verst. Steink. Wettin, 84-85, tab. 31, fig. 5 a , 5 b ; — Gieb., Ins. 

 Vorw., 315. Not Bl. flabellata Germ., Miinst. Beitr. (for which see Etobl. Jlabel/ata). 



Fore wing. The costal margin is rather strongly and regularly arcuate," while the inner 

 margin is straight ; and the wing, being broadest at the end of the basal third, tapers very 

 regularly thereafter to the tip, which is broken, but probably well-rounded; the veins orig- 

 inate a little above the middle of the base, and curve a little upward at first. The medias- 

 tinal vein is arcuate at base, straight and subparallel with the costal margin beyond and 

 past the middle of the wing, curving gently toward the margin, which it does not reach until 

 about the middle of the apical fourth of the wing ; the area is very broad, being fully two- 

 fifths the entire breadth of the wing in the middle of the latter, and emits a large number, 

 a dozen or more, of nearly straight, mostly simple, occasionally forked, branches, the basal 

 ones transversely oblique, the apical longitudinally oblique. The scapular vein is very sim- 

 ple, broadly sinuate, follows the course of the mediastinal vein, and, passing nearly through 

 the. centre of the wing, forks once in the middle of the apical half of the wing, and occupies 

 only an extreme^ narrow area on the extreme apical portion of the costal margin. The 

 externomedian vein appears to be coalesced with the scapular in the basal fourth of the 

 wing, but both before and after its separation follows exactly parallel and close to the inter- 

 nomedian vein, which terminates probably almost as near the apex as the scapular vein, 

 leaving for the externomedian vein oidy the very apex of the wing ; it begins to branch a 

 little before the middle of the wing, and emits, at equidistant intervals, three longitudinal 

 branches, the middle one arising in the middle of the wing, and simple, the others simply 

 or doubly forked, so that the apex is crowded with veins. The internomedian vein is rather 

 strongly arcuate at base, then runs downward in a nearly straight line toward the middle of 

 the apical half of the inner margin, until nearly the end of the middle third of the wing, 

 when it turns suddenly outward, and runs parallel to the inner border, doubtless afterwards 

 approaching it, and probably terminating only when the apical margin is reached ; it emits 

 about eight straight, oblique veins, the short apical ones only slightly more longitudinal, all 

 simple excepting one which is compound, and fills the apical part of the regular portion of 

 the area. The anal furrow is distinctly impressed, rather gently and regularly arcuate, and 



