Mr. R. Shelford's Studies of the Blattidae. 275 



The types measure 22-23 mm. in length. Specimens 

 from Melbourne and W. Australia have the thoracic 

 tergites margined with rufo-castaneous and the tibiae 

 partly rufo-castaneous but otherwise appear to be the 

 same as the typical form. 



Tasmania (Berlin Mus., types) ; New South Wales, 

 Tarangower (Vienna Mus.) ; Victoria, Melbourne (Mel- 

 bourne Mus.) ; Western Australia, Boorabbin {Michael- 

 sen and Hartmeyer), (Hamburg Mus. ; Oxford Mus.). 



11. P. invisa, Walk. (PL VIII, figs. 15, 16.) 



Pcri'plancta invisa, Walker, Cat. Blatt. Brit. Mus., p. 

 137 (1868), (? only). 



Piceous, nitid, iinpunctate, margins of segments rather scabrous. 

 Antennae in basal third piceous, remainder rufo-castaneous. No 

 tegminal rudiments. Abdominal stigmatic dots very distinct. 

 Supra-anal lamina, ((^) triangular, apex deeply notched, a short 

 spine on either side of the notch, ( 9 ) triangular, longer than in P. 

 melanaria, cucullate, apex deeply emarginate, lateral margins 4-den- 

 tate. Cerci longer than supra-anal lamina in ^ , shorter in $ . 

 Siibgenital lamina ( (^ ) quadrangular, scabrous without a spine at 

 base of styles. 



Length ( ,^ ) 33"5 mm., (?) 31 mm. ; pronotum 8 mm. x 1? -13 mm. 



Western Australia, Swan River (Oxford Mus., $ 

 type ; British Mus., $ type) ; New South Wales, Gosford 

 (W. W. Frorjgatt) (Oxford Mus.). 



12. P. consohrina, Sauss. 



Polyzosteria consohrina, Saussure, Rev. Zool. (2) xvi, p, 

 306 (1864). 



The identity of this species is very uncertain and the 

 type appears to be lost ; it may be merely a larval form of 

 invisa or identical with atrata, the latter appears to be 

 more likely. 



" Australia." 



13. P. rufice;ps, Shelf. 



Platyzostcria rvficcfs, Shelf ord, \in'\ Fauna Slid west 

 Austral., ii. Lief. 9, Blattidae, p. 134, PI. XIII, %. 3 

 (1909). 



Western Australia, Moora {Michaelscn and Hart- 

 meyer), (Hamburg Mus., type). 



T 2 



