766 COLLECTION OF DRAGONFLIES FROM CENTRAL AUSTRALIA, 



coloured, followed below on each side by an equal and parallel 

 band of the groundcolour; rest of sides and underside pale straw- 

 colour. Legs straw-colour, touched with black near joints. 

 Abdomen cylindrical, rather stout, 8-10 somewhat clubbed. 

 Colour: dorsal surface dark metallic green, broken at the sutures 

 (except for a very tine mid-dorsal line) by narrow transverse 

 bands of pale straw-colour. .Sides straw-colour shaded with 

 green; sides of 8-9 shaded with dark brown; 10 exceedingly 

 small, straw-coloured, a small square dorsal spot of dark metallic 

 green. Appendages very remarkable. Superior about 

 1 mm., slightly separated, broadly subcornnte, pale straw-dolour. 

 Inferior very large, projecting nearly 0'5 mm. beyond superior; 

 bases wide, subconical, pale straw-colour; the extremities, how- 

 ever, thin, black, forcipate; separated by a small projection on 

 segment 10. Seen sideways, they appear to curve slightly 

 upwards (Plate xlii., tigs. 6, 8). 



5. Very similar to male. Wings slightly longer, head and 

 thorax slightly larger. Abdomen very slightly broader, 8-10 

 enormously clubbed; colour same as in male; 10 projecting below 

 appendages into a black rounded tubercle. Ovipositor reaching 

 beyond end of 10, brownish, with a pair of black divergent 

 filaments 0*5 mm. long. Appendages close together, short, 5 mm., 

 subconical, brownish. 



Hah. — Tennant's Creek, N.T.; very rare; two males and a 

 female in poor condition; April, 1906. 



A most remarkable insect, but dull-coloured and very likely 

 to be overlooked. Easily distinguished from its nearest relative, 

 Isosticta simplex Martin, by its shorter and thicker abdomen 

 and by the generic characters given above. 



In conclusion, I wish to tender my heartiest thanks to Mr. J. 

 F. Field for the interest and keenness with which he undertook 

 to supply me with specimens, and to his aboriginal servant, Billy, 

 who wielded the net with the greatest sagacity and discrimina- 

 tion, and evidently handled the specimens with much care. 



