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



4. E. ixitida, Walk. (PI. VII, fig. 2.) 



Polyzosteria 'patida, Walker, Cat. Blatt. Brit. Mus 

 p. 157 (1868). 



Broadly elliptical. Above dark aeneous-green, posterior margins 

 of thoracic tergites narrowly testaceous interrupted by maculae of 

 the ground colour, posterior margins of abdominal tergites with 

 flavo-testaceous maculae. Dorsal surface finely rugose. Head aeneous, 

 coarsely rugose; mouth-parts flavo-testaceous; antennae castaneous 

 at base, remainder rufous. Pronotum with lateral margins slightly 

 incrassated and elevated, laterally broadly testaceous, posterior angles 

 slightly produced. Supra-anal lamina, {^) subquadrangular, lateral 

 margins serrate, (9) rugose, trigonal, aj)ex not emarginate. Cerci 

 very short, not exceeding the lamina, testaceous. Posterior angles 

 of 7th abdominal tergite scarcely produced, 8th abdominal tergites 

 with spiracles visible at their external angles; external angles of 

 9th tergite produced as blunt processes. Beneath testaceous. Legs 

 testaceous, with upper aspect of femora and tibiae brilliant metallic 

 green. 



Length {$) 30 mm., ($) 3.3 mm., pronotum {$) 10 mm. x 

 20 mm., ( $ ) 11 '5 mm. x 22 mm. 



This is a somewhat aberrant species and appears to be 

 intermediate between Eiizosteria and Anamcsia. 



South Australia, Northern Territory (British Mus., 

 type; Adelaide Mus.); Western Australia, Towranna 

 plains (Oxford Mus.). 



5. E. mitchellii, Angas. 



BlcdtamitchcUii, Angas, S. Australia Illustr. PI. XL VIII, 



fig. 1 (1847). 

 Polyzosteria mitchellii, Saussure, Mem, Sci. Phys. Nat. 



Geneve, xxiii, p. 106 (1873) ; Tepper, Tr. E. Soc. S. 



Australia, xvii, p. 78 (1893) ; Froggatt, Australian 



Insects, p. 19, fig. 5 (1907). 



Tepper describes the colours of fresh specimens, which 

 are very brilliant. In the female the pronotum anteriorly 

 is parabolic, whereas in the male it is widely arched and 

 subsinuate, the measurements show the difference in form 

 very clearly ( ^ 10 mm, X 21 mm., ^ 11 mm. X 21 mm.); 

 this sexual dimorphism in the form of the pronotum is 

 unusual. 



Victoria; S.Australia; Western Australia. 



