Mr. R. Shelford's Studies of the Blattidae. 267 



P. invisa, Walk. 

 P. consobrina, Sauss. 

 P. ritficeps, Shelf. 



P. punctata., Br. 



8. Lateral margins of 

 supra-anal lamina 

 (^) serrate or mi- 

 nutely denticulate. 

 9. Posterior angle of 

 9 th abdominal ter- 

 gite bispinous . P. bifida, Sauss. 

 9'. Posterior angle of 

 9th abdominal ter- 

 gite not bispinous. P. atrata, Er. 

 8'. Lateral margins of 

 supra-anal lamina 

 (cj) not serrate nor 

 denticulate. 

 9. Large species (ex- 

 ceeding 30 mm.). 

 9'. Small species . . 

 5'. Vertex of head orange-rufous 

 4'. Thoracic tergites transversely 



seriate-punctate 



3'. Dorsal surface distinctly scabrous. 

 4. Lateral margin of 7th abdominal 



tergite not serrate .... P. variolosa, Bel. 



4'. Lateral margin of 7th abdominal 



tergite serrate. 



5. Larger (27-31 mm.), antenna? 



fuscous, lateral margins of 



thorax not paler than 



disc P. scahra, Br. 



5'. Smaller (19-23 mm.), anten- 

 nae rufous, lateral margins 

 of thorax paler than disc . P. scabrella, Tepp. 

 2'. Tegminal rudiments present. 



3. Tegminal rudiments on their 

 inner side only half separated 

 from the mesonotum. 

 4. Coxae margined with testaceous. 

 5. Lateral margins of 7th ab- 

 dominal tergite not serrate. 

 5'. Lateral margins of 7th ab- 

 dominal tergite serrate . . 

 4'. Coxae not margined with 

 testaceous. 

 5 Legs bright rufous .... P. rufipes, sp. n. 



P. coxalis, Walk. 

 P. biglumis, Sauss. 



