BY R. J. TILLYARD. 313 



species was described, S. flavoterminata Martin.* Further addi- 

 tions -were S, pritnigenia Fdrster, from New Guinea,! S. nigra 

 TillyardjJ S. cyanitincta Tillyard,§ *S'. inarfAni Tillyard,|| ^S". 

 olivei Tillyard,^ .?. claincidata Tillyard.** Through the kind- 

 ness of Dr. F. F. Laidlaw, of London, who has carefully studied 

 the immature and somewhat damaged type of S. leachii Sel3's, in 

 the British Museum, and has compared it with cotypes of ^S*. 

 martini Tillyard, it has been established without doubt that the 

 two are one and the same species. The name martini Tillyard, 

 therefore becomes a synonym of leachii Selys. This leaves 

 fourteen well-established species in the genus. A new species 

 will be described in this paper, together with the hitherto 

 unknown female of >S'. clavicidata, which has just come to light. 

 The insects comprising this genus are among the most beautiful 

 and graceful of Australian Odonata. But papered specimens 

 invariably lose their beautiful colours, and the bright yellow and 

 creamy spots and stripes often fade away into a dull brown. 

 Apparently this has added considerably to the difficulty of 

 identification; for the genus has always been regarded more or 

 less as a puzzle. It was therefore, to me, a great advantage to 

 be able to study them in the field, when I found that some of 

 the most closely allied species difFei'ed both in habit and coloura- 

 tion, and could be separated by the eye, even when flyingj 

 though, when dried and placed in a collection, the determination 

 was not so easy. I therefore determined to note carefully the 

 colours of each species, and perpetuate them in water-colour. 

 These drawings are reproduced in the two coloured plates 

 attached to the paper. I venture to hope, on the principle that 

 " an accurate drawing is better than the most lengthy and 



* ''Odonates da Continent Australien," Mem. Soc. ZooL France, 1901. 



t Ann. Mus. Nat. Hungaiici, 1903. 



+ Proc. Linn. Soc. N. S. Wales, 1906, p.4S9. 



§ Loc. cit. 1907, p. 724. 



II Loc. cit. 1907, p. 726. 



H Loc. cit. 1908, p. 747. 



** Loc. cit. 1908, p. 749. 



