134 Sellards — Structure of Paleozoic Cockroaches. 



Figure 20. — E. juvenis sp. no v. One wing and half of pronotum of 

 nearly mature nymph. 



Figure 21. — Trochanter, femur, and one abdominal tergum of nymph. 



Figure 22. — Spiloblattina. Part of abdomen in which are seen indications 

 of color areas resembling those of Spiloblattina, to which genus the speci- 

 men is provisionally referred. 



Figure 23. — A small nymph, genus undetermined. 



Figure 24. — Pronotum of small, probably adult, cockroach. 



Figure 25. — An undetermined fossil, resembling very much the egg case 

 of cockroaches. 



All figures are twice natural size. Original of Figures 18 and 19 in the 

 University of Kansas collection ; all others in the writer's collection. All are 

 from the Upper Coal Measures. Figure 23 is from Deer Creek, twelve miles 

 S.W. of Lawrence ; others are from Lawrence, Kansas. 



free edges of the terga are evident. The cerci, although incom- 

 plete, are un usually long. The specimen figured and its 

 counterpart are in the writer's collection. A number of other 

 nymphs of this species have been obtained from the same 

 locality, one of which (University of Kansas collection) is illus- 

 trated in Figure 18. The pointed terga and rounded sterna, 

 similar to the detached terga and sternum of Figure 17, are 

 here seen in place. The large nymph, previously figured, is 

 probably also of this species, although the body is larger and 

 more bulky. * The free edges of the terga from the third to 

 the ninth are very prominent. The tenth sternum is rounded. 

 The sterna with their rounded corners are seen in outline through 

 the terga. A part of the strong femur is seen on the right, and 

 a few segments of the antennae are visible beyond it. The refer- 

 ence of these nymphs to the genus JEtoblattina is supported by 

 the rounded character of the sterna, which are similar to 

 those of F. mazona, and by association, more than half of the 

 adult species from the Lawrence locality belonging to this genus. 

 Formation and Locality. — Lawrence Shales, Upper Coal 

 Measures, Lawrence, Kansas. 



Genus Undetermined. 



The generic reference of the small nymph (Figure 23) is in 

 doubt. The abdomen has been torn and crushed, but the ten 

 segments can be made out. A few of the sterna seen in out- 

 line through the terga are pointed at their posterior corners. 

 A tibia, tarsus, and a part of the femur lie in front of the 

 pronotum. The number of segments of the tarsus can not be 

 made out, but the claw terminating the foot is preserved. 



The pronotum (Figure 24) is found detached, and judging 

 from its rounded form probably belongs to an adult. 



Formation and Locality. — Both the nymph of Figure 23 

 and the pronotum of Figure 24 came from the Lawrence 

 Shales, Upper Coal Measures, Lawrence, Kansas. 



* This Journal, vol. xv, April, 1903, pi. vii, fig. 5. 

 [To be continued.] 



