BY R. J. TILLYARD. 731 



often with two small anal spots; 9, very irregularly varied with 

 yellow and brown both above and on the sides, the brown on the 

 dorsum cleaving the yellow by a sharp point running up almost 

 to the base; 10, yellow, shaded with brown in the suture. The 

 markings of 7-10 are very irregular and varied, no two specimens 

 being alike. Appendages: Superior about 1 mm., separated, 

 divergent, subcornute, pale yellow, carrying underneath a large 

 hook, brown tipped with black. Inferior wide apart, divergent, 

 slightly upcurved, pale brownish, 0-3 mm. 



9 (unique). Differs from the male as follows : — A somewhat 

 larger insect; pterostigma larger, orange-brown between black 

 nervures. Head and thorax as in male. Abdomen slightly 

 broader than in male, more cylindrical; 1-2 slightly swollen, 8-10 

 tapering. Scheme of markings as in male, but giving a very 

 different effect, owing to the difference in the size of the markings. 

 Oround colour almost black, appearing as if burnt to a reddish- 

 brown in places. Yellow markings as follows : — 1, a dorsal spot, 

 and a large spot low down on each side ; 2, an irregular longi- 

 tudinal dorsal mark, shading to brown; a small yellow spot on 

 each side; rest of sides mottled with brown and yellow: 3, a 

 double basal dorsal spot, a pair of central dorsal spots just 

 separated and pointed anally; basal half of sides yellow; a small 

 lateral anal spot on each side: 4-7, the transverse basal band 

 very broad on the sides, then narrowing above and cut into lobes 

 by a tine dorsal line of brown; on 3-4 the central dorsal markings 

 are present, but on 5-6 they are obsolete or almost so, a tinge of 

 burnt sienna taking their places; on 7 the}?- are present and close 

 up to the basal band. All these segments have also a small 

 round sublateral anal spot on each side; 8, a dorsal spot tinged 

 with burnt sienna; sublateral parts yellowish; 9, as in the male; 

 10, brownish above, yellow on sides. Appendages straight, 

 separate, 1 mm., somewhat pointed, yellow. 



Hah. — Margaret River district; very rare. I took several 

 males, but only one female. It is fond of settling on trees and 

 bushes, and is not difficult to capture, though its flight is erratic 

 and fairly fast. 



