132 Sellards — Structure of Paleozoic Cockroaches, 



center and been pushed to each side, thus exposing the basal 

 elements of the legs. The most striking feature is the large 

 size of the second segment, — the trochanter, which, instead of 

 being wedged into the lower angle between the femur and 

 coxa, is apparently joined squarely to the femur. The speci- 

 men has been crushed and drawn out laterally, thus causing 

 the trochanters on the left to appear abnormally large and those 

 on the right too small. The median organ in front of the first 

 pair of legs, probably one of the sternal elements, has suffered 

 a similar distortion. The basal part of the ovipositor, 9 mm long, 

 is preserved in place. Parts of the body are scattered about 



Figure 17. — Etoblattina juvenis sp. nov. ; natural size. Two specimens 

 lying near each other on the same slab. The nymph on the left shows a con- 

 siderable part of the cerci, which in this species are very long. Both have 

 the legs more or less completely preserved. As a result of crushing, the 

 integument of the nymph at the right has split along the dorsal line, and, 

 spreading laterally, exposed the basal elements of the legs otherwise 

 rarely seen. The species has a large, prominent ovipositor, which is pre- 

 served on the specimen at the right ; it is badly crushed, however, and its 

 shape poorly defined. Some terga with pointed angles, and sterna with 

 rounded, angles, are seen detached and lying between the two nymphs. 



Original from the Upper Coal Measures at Lawrence, Kansas, in the 

 writer's collection. 



on the slab. Detached terga with their pointed edges, and 

 one of the sterna with rounded edges, are seen lying between 

 the two nymphs. The nymph on the left of the figure is more 

 nearly entire. The head is displaced to the right of the pro- 

 notum. The antennae are very well preserved, but the other 

 structures of the head are too much crushed to be recognized. 

 On the pronotum is seen a circular mark characteristic of the 

 species. Traces of the venation are evident, the cubitus and its 

 branches, as is usual among nymphs, being the most distinct. 

 Parts of the legs are exposed at the sides of the body. The 

 tibia is spinous and the tarsus apparently long. The pointed 



