744 ON SOME REMARKABLE AUSTRALIAN CORDULIINjE, 



AUSTROCORDULIA, n.g. 



Allied to Oxygastra Selys (Europe), and Syncordulia Selys 

 (Australia). Triangles, hypertrigonal and basilar spaces of all 

 wings free. Inner angle of triangle of hindwing placed just 

 beyond level of nodus. Sectors of arculus arising separately on 

 all four wings. Two rows of discoidal cells following the triangle 

 of the forewings. Only one cross-nervule in submedian space of 

 all four wings; hence no small subtriangle in hind wings. Triangle 

 of hindwings remarkably long (shaped as in the Aeschnidce, but 

 free). Anal triangle of hind wings of male crossed by one nervule, 

 low down. Thorax very short. Superior appendages of male 

 very long, inferior long and triangular. 



Type : Austrocordulia refracta, n.sp. 



This remarkable genus can be at once distinguished from both 

 Oxygastra and Syncordulia by the following points : — the 

 remarkable shape of the hindwing triangle, the lack of a second 

 cross-nervule, and hence of a subtriangle, in the submedian space 

 of the hindwing, and the possession of a small cross-nervule low 

 down in the anal triangle of the hindwing of the male. 



It resembles Oxygastrain possessing two rows of post-triangular 

 cells in the forewing, while Syncordulia has only one row. 



5. Austrocordulia refracta*, n.sp. (Plate xxii., fig. 2). 



<J. Total length 49 mm.; abdomen 38 mm.; forewing 30 mm.. 

 hindwing 29 mm. 



Wings: nenration blackish, costal and subcostal spaces 

 slightly suffused with brown, especially at base and nodus, 

 Pterostigma 2*5mm., orange-brown between black nervures. Mem- 

 branule, fore, very small; hind, 2-2 mm., white. Nodal Indicator 



9 6 first two or three postnodals of all wings not continuous. 



6 6 7 Head: eyes and vertex dark brown; central ocellus 

 large, transparent reddish; front and clypeus hairy, shining, 

 brown; labrum brown touched with fulvous; labium shiny 

 brownish. Thorax: prothorax small, brown. Meso- and 



* Named from the peculiarly bent or broken appearance of the appendages^ 



