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



Distinguished from the two preceding species, its nearest 

 allies, by the form of the supra-anal lamina (^). 



West Australia, Boyanup {Midiaelsen and Hartmeyer), 

 (Hamburg Mus., type). 



40. P. obscuripes, Tepp. (PI. VIII, fig. 23.) 



Drymnplancta ohscuripes, Tepper, Tr. R. Soc. S. 

 Australia, xvii, p. 112 (1893). 



I have seen no mature examples of this, and strongly 

 suspect it of being the larva of one of the three 

 preceding species. The larval condition of the $ sub- 

 genital valves is employed by Tepper as one of the 

 diagnostic characters of his genus Drymaplancta! 



South Australia, West coast ; West Australia, 

 Fraser range (Adelaide Mus., types). Swan river (Oxford 

 Mus.). 



41. P. spenceri, sp. n. 



^ . Piceous, nitid, impunctate. Disc of abdomen beneath rnfo- 

 castaneous. Margined all round continuously with flavo-testaceous, 

 outlined outwardly with piceous ; the supra-anal lamina and cerci 

 piceous or castaneous. Tegminal rudiments absent. Posterior angles 

 of all the abdominal tergites very acutely produced, especially the 

 8th. Lateral margins of 6th tergite serrate, of 7th denticulate. 

 Supra-anal lamina acutely triangular, terminating in a pair of 

 diverging spines, lateral margins denticulate. Cerci not exceeding 

 the supra-anal lamina. Terminal sternites laterally finely tuber- 

 culate. Posterior margin of 6th abdominal sternite strongly 

 denticulate, posterior margins of the two preceding sternites laterally 

 with smaller denticles. Sub-genital lamina small, sub-quadrate, 

 styles very stout, incurved, equal to the cerci. Coxae narrowly 

 bordered with testaceous. Legs piceous. 



Length 28 mm. ; pronotum 7 mm. x 10 mm. 



Central Australia (Spencer-Gillen expeditioii), (Mel- 

 bourne Mus., type ; Oxford Mus., co-type). 



42. P. soror, Br. (PI. VIII, figs. 24rf, 24&.) 



Polyzosteria soror, Brunner von Wattenwyl, Nouv. 



Syst. Blatt., p. 219 (18C5). 

 Pcriplancfa scuiiciniia. Walker, Cat. Blatt. Brit. Mus., 

 p. 140 (1868). 

 This is the insular form of the next species ; it can be 



