462 NEW AND RARE AUSTRALIAN AGRIONID^, 



23. ISCHNURA TORRESIANA, n.Sp. 



cf. Total length, 28-5; abdomen, 22-5; Imidwing, 15 mm. 



Wings: pterostigma 0-5 mm., scarcely covering a whole 

 cellule ; that of forewing blackish, nearly surrounded by 

 white, and paler distally ; that of hindwing much paler ; 

 eight postnodals in fore, seven in hindwing. Head: posl- 

 ocular spots small, blue; epicranium black, a blue band bor- 

 dering the front; postclyjyeus black; anteclypeus bluish; lab- 

 nun blue with a black line above; labium pale straw-coloured. 

 Thorax: prothorax metallic black, posterior border finely 

 ridged and upturned. Meso- and metathorax practically 

 sntoof/i, of medium size, black above, the antehumeral stripes 

 reduced to a short blue line on each side close up to pro- 

 thorax ; sides blue, shading to greyish underneath. Legs 

 short, blackish, underside of femora bluish. Abdomen 

 fairly slender, cylindrical, 1-2 and 9-10 scarcely wider than 

 the rest. Colour: 1-3 black above, blue on sides, 4-7 metallic 

 bronzy-black above, pale yellow along sides, 8-9 completely 

 blue except for a touch of black near bases, 10 black, scarcely 

 upturned at tip. Appendages: superior 0-2 mm., blunt, 

 black, with a conspicuous inferior lobe projecting downwards 

 (only visible in profile) ; inferior very thick and truncate. 

 Compared with that of 7. heterosticia, the end of the abdo- 

 men is less upraised, broader dorsally, and the two sets of 

 appendages project about equally beyond it ; whereas in I. 

 heterosticta the inferior project slightly further than the 

 superior, and are more pointed al)ove(PIate xlviii., figs. 5, 6). 



5. Total length, 31 5; abdomen, '25; hindwing, 17 '5 mm. 



It differs from the male as follows. Pterostiyma unicolorous, 

 It differs from the male as follows. Pterostigma unicolorous, 

 pa,le gi'ey, between black nervures ; those parts of the head 

 which are blue in male are greenish-blue or greenish-grey ; 

 thorax with a pair of narrow antehumeral bluish stripes ; 

 abdomen broader; 1, blue; 8-10 and sides of 7 blue, a little 

 black close up to bases; appendages 0'3 mm., black, bluntly 

 pointed. 



