Fauna and Stratigraphy of the Stormbe.rg Series. 



333 



are differences, too, from the genotype T. tijpica in the number of 

 branches of R, M, and Cu. 



From Samaroblatta it differs in the shorter and narrower humeral 

 area, in that the distal portion of R probably reached the apex. 

 In other points it approaches fairly closely to this genus, especially 

 in the possession of intercalated ridges and a cross-venation. The 

 difference in branching of R, M, and Cu is not of great moment; 

 Tillyard has pointed out that not only different individuals of the 

 same species of Cockroach, but also even the right and left tegmina 

 of the same individual, show considerable differences in this respect. 



Fig. 3. Striatotegmen africanum, Htn. 

 Venation of tegmen. 



From Austroblatta, with which it agrees in size, it differs in the 

 smaller humeral area, the pronounced bending of R, and the pre- 

 sence of intercalated veins. 



In general characters it agrees closely with Mesoblattula from the 

 Lias of Mecklenburg. It shows the same reduced subcosta; the hu- 

 meral area shorter than the anal, the same strongly double-curved 

 radius, and the same general features of M and Cu As in Meso- 

 Uatiula there are intercalated ridges, and evidence of occasional 

 cross-venation (cf. M. geinitziana). Unfortunately the anal area is 

 unknown in the genus Mesoblattula. Our form differs from this genus 

 in that the anterior branch of the medial is apparently not forked; 

 in this it differs also from Mesoblattopsis, Liadoblattina, Rhipidoblat- 

 tina and Caloblaitina, and apparently agrees with Mesollatlina. It 

 agrees also with Mesoblattina in the reduced humeral area and the 

 simple subcosta; but the area covered by the radius is larger in the 

 South African form, the radius is more strongly curved, and there 

 are fewer primary branches. The tegrnen, too, is somewhat broader. 



Two genera of this family have been described from the "Rhaetic" 

 of Tonkin Rhaetoblattina Handl. and Hongaija Handl. Both of 

 these are larger than our form. In each the humeral area is short, 



