206 



Treubia Vol. Ill, 2. 



Distribution: Pegu; Tenasserim; Malay Peninsula; Sumatra; Borneo; 

 Java; Halmahera. 



, Subfamily BLATTINAE. 



Platyzosteria denini, n. sp. 



1 cf, Ceram, Wahai (Denin, August 1919). 



Shining black. Supra-anal lamina orange, with three black blotches at its anterior, 

 and two at its posterior margin. Posterior margins of the 1st, 2nd, & 3rd abdominal 

 tergites smooth; minutely spined in the 4th, more so and gradually increasing in the 

 5th, 6th, & 7th tergites. Tegmina scale-like. Wings absent. Supra-anal lamina (o^) roun- 

 ded, 3 mm. in length, 6 mm. in width, with a small crescent-shaped piece excised at its 

 posterior margin. Posterior tarsi, cerci & styles missing. 



Total length 36 mm; pronotum 10.5 Xl^ nim; tegmina 5 mm. in length, 9 mm. 

 in width at the base. 



Its general black colour with orange mark- 

 ings gives this species a superficial resemblance 

 to P. bicolor, Kirby, from the Torres Straits; 

 however, this latter species has only two orange 

 spots, viz. one at either side of the 7th abdominal 

 tergite. 



The genus Platyzosteria, Brunner, is chiefly 

 Australian, though a few species have been 

 recorded from the Austro-Malayan (New Guinea) 

 subregion, and even from the Oriental region. The 

 widest range has P. soror, Brunner, which occurs 

 in Singapore, Formosa, Borneo, the Austro- 

 Malayan, Melanesian and Polynesian islands. P. 

 coxalis, Walker, came from Bombay. ') Besides 

 P. soror, the following species occur within the 

 ^''^- ^' rf/fv/ix" '""'"'' Austro-Malayan sub-region : P. bicolor, Kirby, 



from the Torres Straits; P. variolosa, Bolivar, 

 from New Caledonia; P. biloba, Saussure, from Amboina, and P. litarata, 

 Saussure, from New Georgia & the Solomon Islands. None of them seem 

 so far to have been recorded from Ceram. 



I have been able to compare P. denini with the first three of these 

 species, viz. P. soror, P. bicolor, & P. variolosa. They are all considerably 

 smaller than P. denini. In addition, P. soror is black, with orange margins 

 to pro-, meso-, & meta-notum ; P. bicolor, as mentioned above, is black, 

 with an orange spot on either side of the 7th abdominal tergite; P. vario- 

 losa is entirely black. For the two remaining species I have had to rely 



') Shelford, in Gen. Ins., fasc. 109, p. 5, also records P. analis, Saussure, from 

 Bombay, besides from N. S. Wales & W. Australia. I have not been able to trace his 

 authority for Bombay. 



