Mr. R. Shelford's Studies of the Blattidae. 287 



48. P. sexguttata, Walk. 



Periplaneta sexguttata, Walker, Cat. Blatt. Brit. Mus., 

 p. 141 (1868). 



This is a very young larva. 



"Australia" (British Mus., type). 



49. P. halteata, Tepp. 



Platyzosteria halteata, Tepper, Tr. R. Soc. S. Australia, 

 xvii, p. 91 (1893). 



I have been quite unable to recognise this and the next 

 species ; their generic position is problematical. 



50. P. latizona, Tepp. 



Platyzosteria latizona, t. c, p. 92 (1893). 



South Australia, Mount Bryan East (Adelaide Mus., 

 type). 



51. P. coolgardiensis, Tepp. (PI. VIII, fig. 27.) 



Platyzosteria coolgardiensis, Tepper, op. cit., xix, p. 159 

 (1894). 



^ . Rufo-testaceous, impunctate, opaque. Disc of thoracic tergites, 

 a band on each abdominal tergite, disc of abdomen beneath, tibiae 

 and tarsi castaneous or rufo-castaneous. Tegminal rudiments absent. 

 Posterior angles of abdominal tergites 2-5 scarcely produced, of terg- 

 ites 6-7 strongly produced, of tergite 9 sub-lobiform. Lateral margins 

 of 6th and 7th abdominal tergites finely serrate. Supra-anal lamina 

 triangular terminating in two slender spines, barely exceeding the 

 cerci in length. Subgenital lamina trapezoidal, posteriorly very 

 slightly emarginate, styles stout, acuminate. Posterior metatarsi not 

 spined beneath ; its pulvillus apical. 



Length 24 mm. ; pronotum 6 mm. x 10 mm. 



West Australia, Coolgardie (Adelaide Mus., type), 

 Kalgoorlie ( W. W. Froggatt), (Oxford Mus.). 



The above description is drawn up from a specimen 

 determined by Mr. Tepper and kindly presented to the 

 Oxford Museum by Mr. Froggatt. The species is an 

 anomalous one, but seems to fit sufficiently into the genus 

 Platyzosteria. 



