370 AUSTRALIAN CORDULIINiE, 



yellow edged with black; base of 9 with two small double tubex'cles, 

 semi-transparent, very pale, rest of 9 with a rather blunt central 

 black ridge projecting apically (Plate x., figs.7-8) Appendages 

 2 mm., black, downy, nanow-lanceolate, with a rounded hairy 

 tubercular projection of 10 lying below and between them. 



In the female, the wings are often tinged with yellowish-brown 

 on the apical half , between nodus and pterostigma; this disappears 

 in very mature females. 



//«?>.— Fallal, N.S.W.; in December, 1910. Nine males and 

 six females in good condition, taken by myself. 

 Types : (J$ in my collection. 



Alonir the coast of Australia, from South to West Australia, 

 through to Adelaide and Melbourne, and up to north of Sydney, 

 the two representatives of the genus HemicordnUa are H. tau and 

 7/. aiistraliff. The former is found everywhere, even on the 

 smallest waterhole, but the latter is confined to the rivers. My 

 visit to Fallal enabled me to obtain some idea of the distribution 

 of species west of the main ranges. I find that H. tau is by no 

 means common, and usually occurs on stagnant ponds and water- 

 lioles, station-dams, etc., where it has evidently followed settle- 

 ment into the interior. On the main rivers it is very rare, but 

 occurs occasionally. I am inclined, therefore, to regard H. 

 superha and //. intermedia as the western representatives of the 

 genus. Of these two, there is no doubt that the latter fills exactly 

 the place occupied by //. australice along the coast. In flight 

 and habits these two species are very similar, though in coloura- 

 tion //. intermedia inclines rather to H. tau than to //. australice. 

 11. superha has, as far as I know, no coastal representative. In 

 colouration it is almost exactly like Synthemis reyina, the largest 

 and most beautiful of the Synthemina. These two species were 

 flying together high up in the clearings along Tea-Tree Creek, 

 near Fallal. It was quite impossible to tell at sight which 

 species was which, for H. superha imitates the flight of S. regina, 

 soaring slowly and calmly to and fro. If struck at, however, the 

 difference in flight-power is at once evident — H. superha imme- 

 diately making off' at immense speed, while ^. reyina is usually 



