87 



lateral margin (as well as that of meso- and meta-notum) white or 

 pale yellow above and below, narrowly bordered exteriorly with 

 black, very finely rugulose. Wingless. Coxae and femora 

 blackish brown, tibias and tarsi red. Abdomen smooth, lateral 

 margin (inch of lamina) reddish brown ; in the male submarginal 

 ridgelike incrassated, hindangles acutely produced, spinelike 

 (especially of the hindmost segments), dentate ; in the female 

 scarcely incrassated, hindangles much less produced, lateral 

 margin of last segment finely carinate, entire. Supra-anal 

 lamina of male narrow, subtrigonal, apex keeled and emarginate 

 with two large spines ; of female more rounded, slightly dentate 

 towards the apex, deeply and roundly emarginate. Cerci of 

 male narrow, subterete, much shorter than the lamina, and 

 scarcely exceeding the lateral spines ; of female lanceolate, and a 

 little longer. Valvules imperfectly free. 



It is with some diffidence that I insert this species here, as it 

 resembles my genus Drymnjjlaneta very much in aspect, notably 

 the pale margin of the thoracic segments, but the cerci being- 

 short in this species, and long in all the species of the above 

 genus, induced me to retain it here provisionally. In fact, it 

 seems one of those confusing intermediary forms that bother 

 the systematist and delight the l^iologist. 



Hfthitat^Q^ilhevt River (L. Molimeux) : Ravine des Casoars, 

 Kangaroo Island (Tepper): S. Australia; Barrow Range, Central 

 Australia (R. Helms, Elder Exploring Expedition). S. A. 

 Museum. 



Platyzosteria subaptera, Brunner (Syst., 212). 



" Black, rather dull, depressed (female ; male convex). Elytra 

 lobiform, only partly free. Penultimate segments of abdomen 

 and supra-anal lamina rugose, margins of both serrulate. Sub- 

 genital lamina of male transverse, margin straight, angles acute, 

 styles inserted beside the angles." (Subgenital valvules of 

 female distinctly emarginate at the apex.) 



Male. Female. 



Lengt li of iDody ... 1 6 - 1 9 m m . 17-21 m m . 



Length of pronotum 4- 5 " 4-5 " 



Width of pronotum 6-5-8 " 7- 8-5 " 



Width of abdomen — 9-11 



Hnhitnt. — Blakiston, Victor Harbour, Monarto : South Aus- 

 tralia (S.A. Museum) ; Port Adelaide and Melbourne (Brunner). 



