464 DRAGONFLIES FROM AUSTRALIA AXD TASMANIA, 



Tlie presence of a cross-vein in the median space places this 

 insect definitely within the tribe Syntheniini, as does also the 

 larval character of the possession of divergent wing-sheaths, and 

 the general form of the larva, which closely resembles that of 

 Synthemis enstalacta Burm. But, in many other respects, as 

 clearly shown in the generic definition, the insect is more closely 

 allied to Gomphoinacromia. It does, in fact, very neatly bridge 

 the gulf between the two tribes Syntheiuini and Idocorduliini, 

 thus suggesting the possibility of the origin of both these tribes 

 from an ancestor not far removed in structure from the present 

 genus. One might also be led to infer from this that the whole 

 suljfamily CordidiiiuH was originally either of Australian or 

 Antarctic origin, an origin whicli would accord veiy well with 

 its present remarkable distribution. 



Text-fig. 4. 



Wings of Sijiifhtiniopxis (jomplwmacromio'idts, n.g. et sp., q. 



(Hindwing, 25 mm.). 



4. Synth KMiopsis gomphomacromioides, n.sp. 



(Plate xxiii., figs.7-8; Text-figs. 4-5). 



Total leiujtli, 41; abdomen, 30\ /ofe?viiig, 26; hiv.d?ving, 25mm. 



Wings mostly hyaline, venation black; base of costa of all 



four wings with a consi)icuous cream-coloured spot. Bases of 



wings heavily marked with an irregular black patch, extending 



