Blattidae. 135 



Platyzosteria armata, Tepp. 



Platyzosteria armata TEPPER, Tr. Eoy. Soc. S. Australia, XVII, p. 84 (1893). 



Stat. 91, Mount Robinson near Kalgoorlie; Stat. 94, Cool- 

 gardie. (5 <J, 2 $.) 



Platyzosteria curiosa n. sp. 



Plate XIII, Fig. 11, 12. 



?. Piceous, nitid, minutely punctate. Vertex and lateral margins of 

 thorax castaneous. Tegminal rudiments semi-articulated. Posterior angles 

 of 7 th abdominal tergite strongly produced. Supra-anal lamina much pro- 

 duced, not cucullate, semi-oval, apex not emarginate, margins inconspicuously 

 serrate, exceeded by the cerci which are rather long. 



The suture separating the subgenital valves from 6* h abdominal sternite 

 not transverse but V-shaped, the valves themselves not apposed but separated 

 at their apices and depressed. Legs piceous, coxae not margined with 

 testaceous. Length 19 mm.; pronotum 5 mm. X 7 mm - 



Stat. 97, Northam (1 ?). 



Remarks. It is possible that this example is not quite mature, but 

 even if this is the case the species is highly remarkable for the structure of 

 the terminal sternites ; the backward process of the central part of the 6 th 

 sternite seems to preclude the possibility of the complete apposition of the 

 genital valves. A second specimen in the Oxford Museum I refer to this 

 species with some doubt, for though the structure of the apex of the abdomen 

 is the same as in the type example, the legs are rufo-castaneous and the 

 cerci are shorter than the supra-anal lamina. The arrangement of the 

 terminal abdominal sternites in a typical Blattine nymph is shown in 

 Plate XIII, Fig. 13, and a comparison of this with Fig. 11 will show at 

 a glance the peculiarity of P. curiosa in this respect. 



Platyzosteria scabriuscula Tepp. 



Periplaneta seabriuscula TEPPER, Tr. Roy. Soc. S. Australia, XVII, p. 108 (1893). 



Stat. 88, Moora; Stat, 98, Wooroloo; Stat. 99, Lion Mill; 

 Stat. 109, Subiaco; Stat. 139, Brunswick; Stat. 144, Bridgetown; 

 Stat. 145, Donnybrook; Stat. 154, Pickering Brook; Stat. 160, 

 Cranbrook. (Several examples of both sexes.) 



Platyzosteria obscura (Tepp.). 



Periplaneta obscura TEPPER, Op. cit., p. 374 (1893). 



With some doubt I refer two examples to this species, which may 

 be re-detined as follows: 



cJ. Piceous, uitid, except for a few faint punctures on the distal 

 tergites. Antennae fuscous. Tegmiual rudiments present, not quite 



