646 ON SOME REMARKABLE AUSTRALIAN LIBELLULINiE, 



metapleurum, continuing across the underside, and a short brown 

 band arising under the hind wing-join and proceeding along the 

 pleural suture for not more than 2 mm.; notum dark brown or 

 black spotted with yellow or olive-green. Legs black, undersides 

 of profemora and bases of undersides of meso- and metafemora 

 pale straw-colour. Abdomen: 1-2 swollen, 3-6 very slender, 

 7-10 wider. Colour black, marked with yellow in the young, 

 olive-green in the mature insect as follows: — 1 , sides yellowish; 

 2, a transverse basal band, and on each side a very large spot, 

 extending down to the genital appendage, which is very pro- 

 minent, dark brown; 3, a transverse basal band; 4-6, a trans- 

 verse central ring, narrow on 4-5, broader on 6; 7-10 black. 

 Appendages : superior 1 mm., separated at bases, curving 

 inwards to meet at tips, rather slender and of uniform width, 

 pale straw-colour, tips pointed and just touched with brown; 

 inferior 0*8 mm., subtriangular, slightly upcurved, pale straw- 

 colour. 



£. Similar to male, generally slightly larger and with a deeper 

 shading of yellow on bases of wings. Abdomen: 1-3 swollen, 

 4-6 narrow, 7-10 wider; generally with a fine transverse central 

 line on 7; other markings as in male. Appendages short, 

 0'5 mm., conical, pale straw-colour. 



Another very distinct form of the female exists, which may be 

 recognized as follows — size much larger than the usual type; 

 total length 33 mm., abdomen 23 mm., forewing 25 mm., hind- 

 wing 23*5 mm. Bases of wings deeply suffused to level of arculus 

 only; vertex yellow, tibiae pale brown; abdomen marked as follows: 

 1, broad basal band; 2, basal band, lateral central spots nearly 

 meeting on dorsum; 3, with broad transverse band often inter- 

 rupted by brown lines on dorsum; 4 with two transverse narrow 

 bands; 5-6 with a narrow band near base and a wider central 

 one; 7 with a fine basal transverse line and a broad central band 

 narrowest on dorsum; 8-10 black. Pterostigma 2 mm. 



Hab. — Cairns and Kuranda, N.Q. Not uncommon; January- 

 May. 



