218 Sellards — Structure of Paleozoic Cockroaches, 



wing. Tegmina strong, supported by numerous close branches 

 with frequent, comparatively strong, cross veins in all parts of 

 the wing. Subcostal area broad at the base, triangular, extend- 

 ing a little beyond the middle of the wing. The branches are 

 numerous, once or twice forked, the first arising from near the 

 base and the distal more oblique than the proximal. The 

 radius is clearly distinct from the subcosta. The first branch 

 is given off about the end of the basal fourth of the wing and 

 is two or three times branched. The main vein runs in a sinu- 

 ous course, reaching the costal border a little short of the apex, 

 giving off three or four oblique, once or twice forked branches. 

 The media is close to, but distinct from, the radius. It dicho- 

 tomizes first beyond the first branch of the. radius, near the 

 end of the basal fourth of the wing. Both branches dichoto- 

 mize frequently, the numerous divisions filling the distal third 

 of the inner margin and the apex. The cubitus divides early. 

 The branches, dichotomizing two or three times, fill the middle 

 third of the inner margin. The anal area is of moderate 

 extent. The first anal vein gives oft' five superior branches. 

 The first and second of these, arising close to the base, are 

 once forked, the other three being simple. The first four run 

 toward the anal furrow, the fifth turns down parallel with the 

 furrow and passes to the inner border. A forked inferior 

 branch is also given off from the first anal. The greater part 

 of the area is thus occupied by the first anal and its branches. 

 Three other short curved veins can be seen close to the inner 

 border. Length of tegmina, 17 mm ; breadth, 7 mm . 



Formation and Locality. — Lawrence Shales, Upper Coal 

 Measures, Lawrence, Kansas. Type in the writer's collection. 



Archoblattina. 

 Megablattina, Sellards (ncm Brongniart), this Journal, vol. xv, p. 312, 

 April, 1903. 

 Archoblattina*, Sellards, ibid., vol. xv, p. 488, June, 1903. 



Large cockroaches; body bulky, abdomen broad and fleshy ; 

 pronotum large, longer than broad, approaching a rectangular 

 form, truncated or slightly emarginate in front, emarginate at 

 the sides, broadest and rounded behind ; front and hind wings 

 large, overlapping the abdomen. 



Archoblattina Beecheri. Text-figures 30, 31, and 32. 



Megablattina Beecheri Sellards, this Journal, vol. xv, p. 312, April, 1903, 

 pi. viii. 



Mylacridce sp.? Scudder, Bull. U. S. Geol. Surv., No. 124, p. 55, 1895, 

 pi. ii, fig. 4. 



Blattina sp.? ibid., p. 142, pi. x, fig. 16. 



Tegmina large, about three times as long as broad, costal 

 border arched only very slightly, inner border nearly straight. 



- apxuv, prince. 



