486 NEW AUSTRALIAN SPECIES OF THE FAMILY LIBELLULIDJi, 



£. Total length 34-35 mm., abdomen 24 mm.; wings, fore 28-29 1 

 mm., hind 26 mm. 



Wings long, narrow, especially at bases; neuration black; 

 bases generally slightly saffroned, sometimes not at all. Basilar 

 space free; one cross-nervure in submedian space; triangles of all 

 wings free. Pterostigma 2*5 mm., black. Membranule minute,, 

 nearly black. Nodal Indicator 14 10-1 1( 



10-11 10-111 



Head: Occipital triangle very small, black; eyes dark brown; 

 vertex tubercled, hairy, brilliant deep steely metallic blue; antennm 

 2 mm., black; ocelli, central one large, all three transparent, 

 pinkish; front hairy above, very square, brilliant steely metallic 

 blue, sides yellow; clypeus yellow, anteclypeus somewhat recessed 

 under postclypeal ridge; labrum dirty brown, shiny; labium broad, 

 square and large, pale yellow, crossed from top to bottom by a 

 broad black band, genas and mandibles black or very dark brown,, 

 a yellowish spot on each side. 



Thorax: Prothorax black, bordered with yellow in front and 

 behind, and with a small dorsal central yellow spot. Meso- and 

 metathorax metallic greenish-black above, including two narrow 

 parallel dorsal yellow stripes about 1-5 mm. long, separated by a 

 narrow black line along the dorsal ridge; in front of these is a 

 small square yellow spot, and behind them near the wing-joins a 

 pair of small triangular yellow spots close together. Sides bright 

 yellow irregularly marked with metallic greenish-black bands as 

 follows : — A continuation of the metallic groundcolour above 

 starts from near the front wing-joins, and, isolating two yellow 

 spots of which the lower is twice as large as the upper, is con- 

 tinued as a narrow irregular band across to the mesocoxa, where 

 it becomes much enlarged, isolating a yellow spot at the base of 

 the coxa. A similar but smaller band starts from the hind wing- 

 joins and, isolating a triangular yellow spot, proceeds across to 

 the metacoxa, subdividing into a pair of narrow irregular bands, 

 the lower of which spreads out into a big smoky black patch on 

 the underside. A shorter curved black mark connects the base 

 of the abdomen with the middle of the last-mentioned band. On 



