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



rei^resented on abdomen by a 

 series of spots. 

 5. Pale lateral borders not ex- 

 tending inward to posterior 

 margin of pronotum. 

 6. Sub-genital lamina {^) 

 with a spine at base of 

 genital .styles .... P. soror^ Br. 

 6'. Sub-genital lamina {^) 

 without such spine. 

 7. Posterior tibiae of ^ ex- 

 panded and flattened . P. semivitta, Walk. 

 7', Posterior tibiie of t^ not 



expanded and flattened. P. comrrmnis, Tepp. 

 5'. Pale lateral border extending 

 inward to posterior margin 



of pronotum P. subbifasciata, Tepp. 



4'. Pale lateral borders extending 

 on to abdomen. 

 5, Pale lateral borders not ex- 

 tending beyond 5th ab- 

 dominal tergite .... P. liturata, Sauss. 

 5'. Pale lateral borders extend- 

 ing to 7th abdominal tergite. P. circumd^lcta,^ya\k. 



Species incertae sedis P. 6-guttata, Walk. 



P. balteata, Tepp. 

 P. latizonci, Tejip. 

 2'. Ferruginous or transversely banded. 

 3. Tegminal rudiments absent. 

 4. Posterior angles of 9th ab- 

 dominal tergite rounded ... P. coolgai-diensis, Tepp. 

 4'. Posterior angles of 9th ab- 

 dominal tergite spiniform . . P. aposematica, sp. n. 

 3'. Tegminal rudiments present . . P. hartmeyeri, Shelf. 

 Species incertae sedis P, zebra, Tepp. 



1. P. grandis, Sauss. 



Polyzosteria melanaria, var. grandis, Saussure, Mem. 

 Soc. Sc. Phys. Nat. Geneve, xxiii, p. 110(1873). 



This is a distinct species ; though the form of the supra- 

 anal lamina (^) is almost the same as in melanaria, the 

 margins of the abdominal tergites are more scabrous, the 



