BY R. J. TILLYARD. 741 



Hab. — Common at Mungar's Lake, Perth ; rather rare at 

 Armadale, Bridgetown, Wilgarrup and Margaret River. A very 

 beautiful and conspicuous little insect. It flies close to the 

 water and is fond of settling on floating leaves of water-plants, 

 or on stems of grass or reeds. 



This species is very closely allied to P. cyane Selys, .of the 

 eastern States. The males can be at once distinguished by the 

 greater amount of blue on the abdomen of P. a/irulewm; in 

 particular, segments 3 and 7-9; P. cyane has only a narrow band 

 of blue on 3, no blue on 7, and some black at the anal end of 9. 

 The females are absolutely different; that of P. cyane being dark 

 bronzy -black with pale olive-green markings. 



28. Xanthagrion erythroneurum Selys. 



Common at Mungar's Lake, Perth. I did not find it in any 

 other locality. It is widely distributed over Australia, local, but 

 generally abundant where it occurs. It is a beautiful insect 

 with deep brick-red thorax; base of abdomen red, rest metallic 

 bronzy-black tipped with blue. Female considerably duller. It 

 is probably confined to the coastal lagoons. 



EXPLANATION OF PLATES XXXIV. -XXXVI. 



Plate xxxiv. 

 Map of South-Western Australia. 

 Railways - — ^".i- — "^ 

 Isohyetals 35" 



Plate XXXV. 



Fig.l. — SynthemU Martini, n.sp. ; ^ appendages, dorsal view. 

 Fig. 2. — ,, ,, „ lateral view. 



Fig.3. — Synthemis cyanitincta, n.sp.; S' appendages, dorsal view. 

 Fig.4. — ,, ,, ,, lateral view. 



Fig. 5. — Austrogoinphus occideutalis, n.sp.; ^ appendages, dorsal view. 

 Fig.6. — ,, ,, ,, lateral view. 



Fig.7. — Austroceschna anacantha, n.sp.; ^ appendages, dorsal view. 

 Fig. 8. — ,, ,, ,, lateral view. 



