BY R. J. TILLYARD. 



765 



Allied to Isosticta Selys, from 

 important points : — 



Genus Isosticta. 



Head narrow, thorax and ab- 

 domen very slender. Superior 

 appendages of male forcipate. 

 Basal postcostal nervule before 

 lirst antenodal (Pl.xlii., fig.l,rt). 

 Superior sector of triangle ter- 

 minating at level of nodus, form- 

 ing 07ie or two postcostal cells 

 (fig. 1,&). Median sector arising 

 at the nodal cross- vein (fig.l,c). 

 Postnodals 10-13. 



which it differs in the following 



Genus Austrosticta. 



Head and thorax stouter, 

 abdomen thicker and shorter. 

 Superior appendages of male 

 straight. Basal postcostal ner- 

 vule after first antenodal (PI. 

 xlii. , fig. 2,0.). Superior sector of 

 triangle terminating beyond 

 level of nodus, forming three 

 large and one small postcostal 

 cells (fig.2,6). Median sector 

 arising slightly before the nodal 

 cross- vein (tig.2,c). Postnodals 

 7-9. 



AUSTROSTICTA FlELDI, n.sp. 



(Plate xlii., figs.6-9). 



^. Total length 37mm., abdomen 29mm. Wings: fore 21mm. 

 hind 20 mm. 



Wings rather narrow, fragile; 



neuration very open and thin; 

 pterostigma trapezoidal, 0*8 mm., pale brownish. Nodal Indicator 

 2 8-9|. Head narrow, width 3*5 mm. Eyes brown, black 

 2 7-8i behind next occiput; epicranium black, a pale straw- 

 coloured line along the occipital ridge, and a curved line of the 

 same colour in front near the clypeus; ocelli black; antennce 

 black with pale brown bases ; postclypeus black, anteclypeiis 

 brownish spotted with black ; labrum bright orange-brown ; 

 labium very pale straw-colour. Thorax: Prothorax rather 

 large, pale straw-colour, with a large squarish dorsal patch of 

 dark metallic green, covering nearly the whole dorsal surface. 

 Meso- and metathorax dark metallic green; a tine straight dorsal 

 ine; a pair of narrow humeral bands, slightly curved, straw- 



