186 NEW AUSTRALIAN SPECIES OF THE FAMILY AGJRIONIDJE, 



Besides this, A. coelistina is distinctly the larger insect of the 

 two I have named it coelistina because of the remarkable colour 

 of the appendages. 



6. ISCHNURA FRAGILIS, n.sp 



g. Total length, 27-28 mm.; abdomen, 22-23 mm.; wings, fore 

 15 mm.; hind 14 mm. 



Wing s. — Very delicate, rather narrow. Pterostigma - 4 mm.,, 

 rhomboidal, dull olive brown. Nodal Indicator 2 9-10 



2 8 



Head small. Epicranium black, carrying behind a narrow 

 bright blue transverse band, enlarged on meeting the eyes. Eyes 

 black above, green beneath. Ocelli bronze. Antenna} black,, 

 basal joint thickened. Poslclypeus green ; anteclypeus dull 

 bluish, a black band along the clypeal suture. Labruni dull 

 bluish. Labium and mandibles pale dirty brown, tipped with 

 black. 



Thorax narrow. Prothorax black, with very narrow 

 blue collar. Meso- and metathorax black above, with a pair of 

 thin blue humeral stripes; sides blue. Scuta and scutella bluish. 

 Underside greyish. Legs grey. 



Abdomen slender; 1-2 slightly enlarged, 3-6 very slender, 

 7-10 slightly enlarged. Colour: 1-8, black with narrow trans- 

 verse white lines along the sutures; 2, marked with bluish-grey 

 on the sides; 7, partly blue on the sides; 9, bright blue; 10, black 

 above, blue on the sides. Underside, 1-6, half of 7, and 10, pale 

 greenish; rest blue. 



A ppendages. — Superior wide apart, very short, rather 

 blunt, slightly divergent, black. Inferior minute (See Plate 

 xvii., fig. 6a). 



£. A slightly larger insect. Total length, 30 mm ; abdomen, 

 25 mm.; wings, fore 17 mm., hind 16 mm. 



It differs from the £ as follows : — 



Head. — The blue band at the back of the epicranium wider, 

 hut duller. Poslclypeus deep olive-green ; anteclypeus and 

 labruni pale greenish. 



