334 Annals of the South African Museum. 



the subcosta reduced to a single vein, the radius strongly double- 

 bent so that it touches at its lowest point the middle line of the 

 tegmen. Hongaya agrees with the South African form in that the 

 upper branch of the median is not forked, in the general nature of 

 the cubitus and median, in the fact that the first anal vein rises 

 from the vena subdividens and ends distally on the wing border, and 

 in the presence of intercalated ridges ; but it differs in the number 

 and nature of the radial branches and in the smaller size of the 

 anal area. Rhaetoblattina has a larger anal area, comparable with 

 that of our form, a small humeral area, and intercalated veins: but 

 the median and cubitus are not so similar to our form as those of 

 Hongaya. In neither of the Tonkin genera are cross-veins described ; 

 and Handlirsch was unable to discern them. 



As was to be expected, this form shows close relationships with 

 the Triassic, Rhaetic and Liassic forms of the Mesoblattinidae, and 

 is more advanced than the Carboniferous and Permian members of 

 the family. It does not seem to fall readily into any one of the 

 described genera and for that reason the new generic name Strinto- 

 tegmen is proposed for it, founded upon the following generic cha- 

 racters: - 



Strintotegmen gen. nov. Tegmen small (under 10 mm. in length). 

 Width just over one-third of the length. Humeral area narrow, 

 and distinctly shorter than the anal area. Sub-costa slightly double- 

 curved, unbranched. Radius strongly double-curved, almost reaching 

 middle line of wing, with eight primary branches, of which the 

 anterior six are simple. Upper branch of median unforked : upper 

 branch of cubitus unforked. Vena dividens strong. First anal vein 

 arising from vena dividens, but not ending distally on it. Intercal- 

 ated ridges present, especially strong in radial, medial, and cubital 

 areas. Cross-veins faintly indicated. 



For this form the specific name Striatotegmen africanmn sp. nov. 

 is proposed. 



Type. Insect on shale, and counter-impression. S. Af. Mus. Cat. 

 No. 5634. 



Locality. Road-cutting, Siberia, Wodehouse, C. P. 



Horizon. Shale-band near base of Cave Sandstone. 



Gen. et sp. indet. 

 Text fig. 4. 



A fragment from Siberia (S. Af. Mus. Cat. No. 2340) shows por- 

 tions of two Blattoid tegmina. Parts of the radius, median, and 



