102 S. H. SCTJDDER ON PALAEOZOIC COCKROACHES. 



says Goldenberg, one may see with a lens a delicate polygonal reticulation in the inter- 

 spaces, which lie represents as formed of very closely approximated cross lines, often con- 

 nected near the middle by oblique cross lines, so as to form elongated interdigitating cells. 



Tliis wing is peculiar, as Goldenberg remarks, for the very slight development of the 

 scapular and externomedian veins, and especially for the apical division of the latter. He 

 might also have added, its open neuration. In comparing it with "Blattina flabellala 

 Germ.," Goldenberg doubtless had in mind our Gerabl. Munsteri, with which it no doubt 

 agrees in general features, but is at once distinguished by the peculiar marks of the species 

 just referred to; it is, however, more closely related to a species described by Goldenberg 

 at the same time, Gerabl. scaberata, which also has very sparse neuration. It differs from 

 this, however, in the character of the mediastinal branches, which are far more longitudinal 

 in Gerabl. scaberata, and some of them also forked, while the division of the scapular and 

 externomedian veins in that species is even simpler than here. In the apical division of 

 these two veins just mentioned it is related to Gerabl. clathrata, but the smaller size and 

 openness of the neuration at once separate it from that species. 



The single specimen comes from a bluish bituminous shale at Wemmetsweiler, near Saar- 

 briicken, Germany. Middle carboniferous. 



Gerablattina scaberata. PI. 3, fig. 3. 

 Blattina scaberata Gold., Faun, saraep. foss., ii, 19, 25, 51, taf. 1, fig. 8. 



Fore wing. The fragment preserved is exceedingly imperfect, and all that can be said 

 of the form of the wing is that its costal border, away from the two extremities, 

 is nearly straight or scarcely arcuate. The neuration of the wing, however, is suffi- 

 ciently preserved to indicate its probable place in this genus, and to distinguish it from the 

 other species of the same. The mediastinaal vein runs parallel to the border in the basal 

 third of the wing, then approaches it very gradually, terminating in the middle of the 

 apical half; it is very distant from the margin, the area probably occupying about one-third 

 the width of the wing ; it emits half a dozen straight and very long, longitudinally oblique 

 veins, some of the basal ones rather deeply forked, the others simple, and all distant. The 

 scapular vein terminates just before the tip, is nearly straight from beginning to end, and 

 probably emits only a single, and that a simple, branch at the middle of the outer half of 

 the wing ; for there is hardly space for more. The externomedian vein runs in a straight 

 course down the middle of the wing, and can hardly fork more than once, 1 and that beyond 

 the middle. For the internomedian vein also runs in a straight line alone; more than half 

 the wing, and must terminate scarcely below the tip ; only one branch of this vein can be 

 seen, and this has an unusually longitudinal trend, like the branches of the mediastinal 

 vein. 



The wing is of tolerably large size, the length of the fragment being 25 mm. ; its 

 breadth, 7.5 mm.; the probable length of the wing is 30 mm., but its breadth can only be 

 conjectured. The base, almost the whole of the lower half of the wing, and a large part 

 of the tip are lost. If the upper surface is exposed, the wing is of the right side. Gold- 

 enberg mentions that no reticulation can be discovered, but that the interspaces are 

 sprinkled with small raised points. 



1 In the plate the branch of this vein should have been given in dotted lines at the base as well as beyond. 



