120 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



distances from this point, but most of them not far from the end of the middle third of the 

 wing; the upper stem, however, has an upper branch, which starts in the middle of the 

 wing and is doubly forked, running in a very straight, longitudinal course almost exactly 

 through the middle line of the wing, its first fork near the end of the middle third, the 

 second near the tip of the wing. The internomedian vein is scarcely arcuate, and by an 

 apical fork is thrown a little further out than it otherwise would be, reaching close to the 

 end of the middle third of the wing ; besides the apical fork it has three branches, emitted 

 near together, not far from the end of the basal third of the wing, straight, oblique and 

 apically forked. The anal furrow is not impressed, regularly and considerably arcuate, 

 bears an inferior, nearly straight branch near the middle of its preserved course, and 

 terminates considerably beyond the basal third of the wing ; the anal veins are scarcely so 

 crowded as the others, simple, forked or compound, arcuate, and subparallel to the anal 

 furrow. 



The wing is a very large one, the fragment measuring 39 mm. in length, and 17 mm. in 

 breadth. The probable length of the wing is 42 mm., making the ratio of the breadth to 

 the length as 1 : 2.5. The wing is from the left side and shows the upper surface, which 

 is covered Avith a network of very numerous, closely crowded, delicate cross veins, visible 

 only by aid of a glass. Heer compares the species with Etobl. primaeva and Etobl. didyma, 

 but fails to point out its closer alliance to Progon. FrilscMi, which he describes immediately 

 afterwards, or to notice the feature which is most characteristic of it, viz., the exceedingly 

 early division of the scapular and externomedian branches, and the nearly uniform longi- 

 tudinal course of all these branches ; no other palaeozoic cockroach has such an abundance 

 of longitudinal veins filling the larger part of the wing. From its congener it is readily 

 distinguished by this feature, and also by the smaller extent of the scapular area as 

 compared to the externomedian, and the far greater size and stoutness of the wing. 



A single specimen, found in the anthracitic schists of the lower quarry of Erbignon, 

 Canton Wallis, Switzerland, is remarkable as the only animal yet discovered there. 

 Middle or upper carboniferous. 



Progonoblattina Fritschii. PI. 3, fig. 12. 



Blattina Fritschii Heer, Viertelj. naturf. Gesellsch. Zurich, ix, 287, 293-94, pi., fig. 2; — 



Gold., Faun, saraep. foss., ii, 19. 



Fore wing. The wing is exceptionally slender and equal, both borders being almost 

 perfectly straight ; the apex and outer half of the inner margin are lost, but the part pre- 

 served is more than three times as long as broad. The veins originate just above the 

 middle of the base of the wings, and have the slightest possible upward curve in passing 

 outward. The mediastinal vein runs subparallel to the costal margin, but always almost 

 imperceptibly approaching it, more rapidly toward the tip, which strikes the margin at the 

 end of the fragment, or a little beyond the middle of the wing ; in the middle the area is a 

 little less than one-third the width of the wing, and it is occupied by about seven longitu- 

 dinally oblique, slightly arcuate, simple veins. The scapular vein runs close beside the 

 mediastinal through the basal quarter of the wing, then turns abruptly although only 

 slightly from it, and runs in a broad, arcuate curve past the middle line of the wing, to 

 strike the border just above the tip, or where a continuation of its basal course would have 

 brought it; it has five superior, obliquely longitudinal branches, the first emitted at the 



