152 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA 



three or four veins; the lower branch is again divided before reaching the 

 middle of the wing, each division being subdivided. Media divides opposite 

 the termination of the anal area, each division giving oif. one or two simple 

 branches. The cubitus is short and gives off three inferior branches, the 

 second of which is forked. The anal area is of medium extent. Length of 

 tegmina, partly estimated, 19 mm.; width 7 mm. Type in the American 

 Museum of Natural History. 



This species resembles in a general way E. permiana Sellards from the 

 Permian of Kansas, an illustration of which is inserted for convenience of 

 comparison (fig. 52 b). The radius of E. texana, however, divides much 

 earlier and occupies a much larger area of the wing than does that of E. 

 permiana. The cubitus of E. texana, on the other hand, is shorter and more 

 lax than that of E. permiana. 



Etoblattina (?) robusta sp. nov. (Text fig. 52 c.) 



Large cockroaches. Tegmina broad in proportion to length. Sub- 

 costal area indistinctly preserved in the type specimen, but apparently 

 broad. Radial area probably reaching to the tip of the wing. Media several 

 times forked, its branches filling the inner part of the apex. Cubitus nearly 

 straight and supplied with about six simple inferior branches. Anal area 

 relatively long, traversed by eight or nine simple veins, the first four of 

 which occupy more than half of the area. The imperfect preservation of the 

 subcostal and radial areas renders the generic determination doubtful. 

 Length of tegmina partly estimated, 30 mm.; width, 14 mm. Type speci- 

 men in the American Museum of Natural History. 



