216 Sellards — Strtict ure of Paleozoic s Cockroaches, 



area is narrow, has a few superior oblique short branches, and 

 extends to, or beyond the middle. The radius reaches nearly 

 to the apex and gives off about three oblique, widely forked, 

 or simple branches. The media has four or five superior 

 branches which fill the apex. The cubital area is well 

 developed, the branches oblique, straight, parallel, and mostly 

 simple. The anal area is supported by a few simple radiating 

 veins. Eleven hind wings of this species have been obtained, 

 one in direct connection with the tegmina. The hind wing is 

 of even thinner texture than the front, and is also marked by 

 light and dark areas. A dark area extends along the costal 

 border and dark bands accompany some of the veins. 



A few specimens preserving parts of the body, especially 

 the abdomen, show evidence of light and dark areas on the 

 body and are, for this reason, provisionally referred to this 

 species (Figure 22). The abdomen is rather slender ; the edges 

 of the terga are of moderate extent. The sterna differ from 

 those of EtoMattina, being pointed at the posterior angles. 

 Length of the tegmina, 22 to 25 mm ; width, 8 to 9 mm . Hind 

 wings, 16 to 18 mm long; 8 or 9 mm wide. 



Formation and Locality. — Lawrence Shales, Upper Coal 

 Measures, Lawrence, Kansas. 



Gerahlattina. 

 Scudder, Mem. Bost. Soc. Nat. Hist., vol. iii., p. 97, 1879. 



Gerahlattina arcuata sp. nov. Text-figure 1 ; and Figure 7, 

 Plate I. 



Tegmina about twice as long as broad, outer border strongly 

 arched, the apex rounded ; inner border nearly straight, inter- 

 rupted by the anal area. Subcosta arched parallel to the inner 

 border, reaching three-fourths the length of the wing, branches 

 numerous, simple, curved, thin, and parallel. The radius is 

 but slightly developed, branches first beyond the middle of the 

 wing, and falls a little short of the apex. The media, like the 

 radius, occupies a comparatively small area, and remains simple 

 until beyond the middle of the wing, its four simple, oblique 

 branches filling the apex. The cubitus is strongly developed 

 and reaches almost to the apex. The first five branches are 

 simple and nearly straight, the others are more oblique, closer, 

 and curved. The anal area is well marked and has about seven 

 simple veins. In texture and general appearance this species 

 presents considerable similarity to S. maledicta. The tegmina, 

 however, are much more strongly arched, and the subcosta has 

 a greater development correlated with a reduction in the radius. 

 Length of the tegmina, 24 mm ; width, 9 mm . 



Formation and Locality. — Lawrence Shales, Upper Coal 

 Measures, Lawrence, Kansas. Type in Kansas Museum. 



