84 



Habitat. — Adelaide, Gilbert River, Sedan, Kangaroo Island : 



South Australia ; Lillimur, S.W. Victoria. S.A. Museum, 13^ 

 specimens. 



Platyzosteria armata, spec. nor. 



Deep shining brown, finely impressed punctate. Head, 

 antennae, and legs reddish brown, labrum and palpi black, apex 

 pale, ocelliform spots small, subtrigonal. Pronotum with 

 shallow depressions forming a faint, equal-sided, triangular pit 

 behind. Abdomen with hind angles of segments very acutely 

 produced as spines, lateral margin of last segment conspicuously 

 dentate ; ventral segments scabrous-rugose at the margin, black: 

 disk smooth, finely punctate, varied with reddish brown. Supra- 

 anal lamina of male triangular, margin straight, entire, deeply 

 and narrowly incised at the apex, the lobes forming long acute 

 spines, with a small spine externally at the base ; of the female 

 with the margin somewhat rounded, prominently dentate, apex 

 emarginate, the lobes forming short broad spines. Cerci obliquely 

 lanceolate, base broad, apex acute, pale. Subgenital lamina of 

 male quadrate, emarginate, scabrous, pale-yellowish at the base ; 

 styles long, acute, spine-like ; subgenital plate of female acutely 

 triangular, very scabrous, black. 



Length of body 

 Length of pronotum . 

 Width of pronotum 

 Width of mesonotum . 

 Width of abdomen 



Habitat. — Fraser Ptange, Western Australia {R. Helms, Elder 

 Exploring Expedition, October, 1891). S.A. Museum. 



This large and remarkal)le species is easily recognisable by the 

 spine-like lateral elongations of the abdominal segments and the 

 spine-like lobes of the supra-anal lamina. 



Platyzosteria rufofusca, spec. nov. 



Reddish-brown, coxas and femora paler reddish, tarsi yellowish, 

 ochraceous. Surface laterally fine scabrous, disk almost smooth. 

 Thoracic segments, with the hind segments much rounded- 

 Abdomen with hind angles shortly produced, sharply angular, 

 lateral margin of last segment slightly and distantly serrate, hind 

 angles of last segments much produced, broad, acute ; ventral 

 margin blackish-brown, rather scabrous, disk nearly smooth, red- 

 dish to piceous. SujDra-anal lamina of female as wide as long, 

 rounded, shortly dentate, not or scarcely emarginate, narrowly 

 keeled. Subgenital valvules black, nearly smooth, subtriangular, 

 obtuse. 



