722 THE DRAGONFLIES OF SOUTH-WESTERN AUSTRALIA, 



network at the bases, which are broad as in the preceding species. 

 Common in the Eastern States, from Clarence River, N.S.W., 

 northwards. 



3. DiPLACODES NiGRESCENS Martin. 



Very rare and local. Two males at Mungar's Lake, Perth; 

 one at Armadale; one at Margaret River; one seen on the wharf 

 at Fremantle. There are several females in the Maclea}' Museum 

 Sydney, loc. Albany. It is also very rare in New South Wales 

 and Victoria (R. Martin). The male is an insect of great beauty, 

 having a very broad and flattened abdomen, brilliant red with 

 large black spots. Female brownish. 



4. DiPLACODES H.EMATODES Burm. 



Fairly common, but somewhat local, Armadale, Waroona, 

 Margaret River; also Albany. Found all over Australia; very 

 common in the central and tropical parts. The male has the 

 abdomen somewhat broad and flattened, brilliant red ivithout 

 spot. Female brown, tips of wings saffroned. 



[D. rubra Kirby, is synonymous with this species.] 



5. DiPLACODES BiPUNCTATA Brauer. 



Fairly common. Perth, Armadale, Waroona; rare at Bridge- 

 town and in the southern localities. Found all over Australia; 

 swarms in Victoria, New South Wales and Queensland. The 

 male has the abdomen narrow and rounded: colour brick-red, 

 with small black spots. Female brown. 



6. Orthetrum caledonicum Brauer. 



Exceedingly abundant around Perth; rarer further south. 

 Round the sandy shores of Mungar's Lake these beautiful dragon- 

 flies may be seen in thousands. The male is a large pale blue 

 insect, female olive-brown. It is one of the commonest of Aus- 

 tralian Odonata, swarming all over the Eastern States, and also 

 in Central Australia in very arid regions. It seems 'particularly 

 fond of dry, hot sand. 



