266 Mr. R. Shelford's Studies of the Blattidae. 



6. Supra-anal lamina, {$) 

 sub-quadrate or trigonal, 

 apex emarginate, ( $ ) 

 triangular, not or scarcely 

 exceeding the cerci. 

 7. Large species (exceeding 



25 mm.) 



7'. Smaller species. 



8. Supra-anal lamina ( ^ ) 

 with three or more 

 spines on either side 

 before the apex. 

 9. Supra-anal lamina, 

 {$) scarcely em- 

 arginate at apex, 

 ( 9 ) shorter than 

 its bi-eadth at 



base 



9'. Supra-anal lamina, 

 {$) deeply em- 

 arginate at apex, 

 ( 9 ) longer than 

 its breadth at base. 



8'. Supra-anal lamina 

 {$) not spined . . 

 6'. Supra-anal lamina, {^) 

 triangular, ( 9 ) triangular 

 and considerably exceed- 

 ing the cerci. 

 7. Lateral margins of 7th 

 abdominal tergite 

 serrate or denticulate. 

 8. These margins denti- 

 culate 



8'. These margins serrate. 

 9. Lateral margins of 

 6th abdominal ter- 

 gite serrate . . . 

 9'. Lateral margins of 

 6th abdominal ter- 

 gite not serrate 

 7'. Lateral margins of 7th 

 abdominal tergite not 

 serrate. 



P. grandis, Sauss. 



P. melanaria, Er. 



P. anuUs, Sauss. 



? P. pseudatrata, Tepp. 



P. aterrima, Er, 



P.ferox, sp. n. 



P. armata, Tepp. 

 P. rvfofiisca, Tepp. 



