288 Mr. R. Shelford's Studies of the Blattidac. 



52. P. nposematica, sp. n. (PI. IX, fig. 29.) 



9 . Pale ferruginous above, disc of pro- and mesonotum, posterior 

 margins of abdominal tergites, 9th tergite, supra-anal lamina and 

 cerci, piceous. Abdomen beneath piceous with the disc castaneous ; 

 legs castaneous. Tegminal rudiments absent. Lateral margins of 

 6th and 7th abdominal tergites serrate, posterior angles strongly 

 produced. Posterior angles of 9th tergite spiniform. Supra-anal 

 lamina triangular, apex notched, lateral margins denticulate. Cerci 

 i)f equal length with the lamina. Ultimate and penultimate stemites 

 laterally scabrous, posterior margins laterally finely dentate. 

 Length 40 mm. ; pronotum 9*6 mm. x 13 mm. 



Central Australia {Spencer-GUlen Expedition), (Mel- 

 bourne Mas., type). 



It is rather remarkable that the three Central Australian 

 species described here should show the same tendency to 

 spinosity of the terminal abdominal segments. 



53. P. hartmeyeri, Shelf. 



Platyzosteria hartmeyeri, Shelford [m] Fauna Siidwest 

 Austral., ii, Lief. 9, Blattidae, p. 138 (1909). 



West Australia, Boorabbin (Hamburg Mus., type). 



54. P. zeWn, Tepp. 



Polyzosteria zebra, Tepper [wt] Horn Expcd. Centr. 

 Australia, ii, p. 362 (1896). 



I am unable to determine the correct systematic posi- 

 tion of this species ; the original description is quoted 

 herewith : — 



" $ . Yellow, banded with piceous, stout. Vertex, a band between 

 and below the antennae, base of clypeus, and a longitudinal stripe 

 reddish-piceous. Antennae and palpi reddish. Pronotum scarcely 

 hooded, not much reflexed laterally, almost smooth, shining, disc 

 indistinctly impressed with very faint dark spots ; hind angles 

 subacute ; hind margin concave. Meso- and metanotum similar, 

 each side with small shallow pits, a dark band rather broad in the 

 middle and convex behind, short ; hind margin of metanotum 

 slightly and angularly produced in the middle. Abdomen almost 

 smooth, except a few scattered pits, dark basal band narrow, not 

 extending to lateral margin, posterior angles rectangular or shortly 

 produced as a small tooth. Legs bicolorous ; coxae pale testaceous, 



