BY R. J. TILLYARD. 723 



7. Nannodythemis australis Brauer. 



Wilgarrup, common. Absent elsewhere. It is widely diffused, 

 but very local, in the Eastern States, especially New South Wales. 

 The western form is larger and handsomer than the eastern form. 

 It is a small stumpy-looking insect, appearing at first sight like 

 some was]3-Iike creature armed with a formidable sting. The 

 male has the abdomen very short and constricted, the end being 

 enlarged into a thick club, brilliant red. It sits about on the 

 grass and reed-stems in marshes, with wings much depressed. 

 Female brownish. 



Subfamily CORDULIIN^. 



8. Hemicordulia AUSTRALiiE Rambur. 



Fairly common on the mountain streams in the south, especially 

 the Blackwood. Common all over the Eastern States. A beau- 

 tiful insect, with deep orange abdomen carrying a broad and very 

 irregular dorsal band, the portions on each segment being more 

 or less clepsydrate. The front of the head carries a pair of 

 brilliant metallic-blue spots, rather square and close together. 

 Female duller. Hindwings of both sexes rounded at the anal 

 margin. 



9. Hemicordulia tau Selys. 



Common everywhere; found throughout Australia, even in the 

 dry central regions. It is larger than the preceding, and far less 

 beautiful. Markings of abdomen similar but duller. The front 

 of the head carries a thick black T on a pale yellow ground; 

 hence the name. 



10. Procordulia (Somatochlora) affinis Selys. 



A very rare species, confined to a few localities in South- West 

 Australia. I took a dozen or so at Wilgarrup, all in a damaged 

 condition, which shews that this insect is out on the wing early, 

 probably in September or October. Also one male at Margaret 

 River. At first sight it is very similar to Hemicordulia austra. 

 lict, but the following points will distinguish it : — the abdomen 

 is not so slender, and the whole form less graceful than that of 



