274 Mr. R Shelford*s Studies of the, Blattidae. 



Angles of abdominal tergites 6- 8 produced as blunt spines. Lateral 

 margins of tergites 6 and 7 denticulate-serrate. Supra-anal lamina, 

 ( (5 ) sharply triangular terminating in two spines, eacb with a small 

 spine at its base and a smaller one further back, ( $ ) triangular, 

 apex deeply cleft, lateral margins with 7 teeth. Sub-genital lamina 

 {^) quadrate. Posterior margin faintly emarginate, scabrous, 

 genital styles stout, acuminate, slightly incurved. Disc of abdomen 

 beneath piceous, scabrous. Coxae and femora rufo-castaneous, tibiae 

 castaneous. 



Total length ( cJ ) 35 mm., (?) 36 mm. ; pronotum 9*5 mm. x 16 mm. 



West Australia, Fraser Range (Adelaide Mus., types) ; 

 Mt. Robinson, Coolgardie {Michaelsen and Hartmeyer), 

 (Hamburg Mus. ; Oxford Mus.). 



8. P. riifofusca, Tepp. 



Platyzosteria rufofusca, Tepper, t. c, p. 84 (1893). 



Unknown to me, except from the description. The 

 form of the supra-anal lamina in the $ appears to dis- 

 tinguish it from the preceding species. 



South Australia, Gilbert River (Adelaide Mus., type). 



9. P. bifida, Sauss. (PI. VII, fig. 10.) 



Polyzosteria bifida, Saussure, Mem. Soc. Sci. Phys. 

 Nat. Geneve, xxiii, p. 110, PI. X, f. 37 (1873). 



The species resembles P. invisa, Walk., but is readily 

 distinguished by the form of the supra-anal and sub-genital 

 laminae in the male, the angle of the 9th tergite moreover 

 is bispinous, a character not met with in other species of 

 the genus. 



Queensland (Geneva Mus., type). 



There is one example in the Oxford Museum from the 

 Burr collection labelled " Brazil," the locality is evidently 

 incorrectly given. 



10. P. atrata, Er. (PI. VIII, fig. 14.) 



Perijylaneta atrata, Erichson, Arch, Naturg., viii, p. 



248 (1842). 



Dr. Kuhlgatz has favoured me with a drawing of 

 the supra-anal lamina of the $ type ; it is triangular, 

 emarginate at the apex and serrated laterally, it is conse- 

 quently very like the supra-anal lamina of P. mclanaria $. 



