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



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 

 ((J) not serrate nor 

 denticulate. 

 9. Large species (ex- 

 ceeding 30 mm.). P. invisa, Walk. 

 9'. Small species , . P. consobrina, Sauss. 

 5'. Vertex of head orange-rufous P. nificeps,SiheU. 

 4'. Thoracic tergites transversely 



seriate-punctate P. punctata, Br, 



3'. Dorsal surface distinctly scabrous. . 



4. Lateral margin of 7th abdominal 



tergite not serrate .... P. variolosa, Bol. 



4'. Lateral margin of 7th abdominal 



tergite serrate. 



5. Larger (27-31 mm.), antennpe 



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. P. coxalis, Walk. 

 5'. Lateral margins of 7th ab- 

 dominal tergite serrate . . P. biglumis, Sauss. 

 4'. Coxae not margined with 

 testaceous. 

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



