BY R. J. TILLYARD. 463 



Family LIBELLULID^. 



Hubfauiily CORDULIIN.E. 



Tribe Synthemini. 



Genus »S v n t h e m i o p 8 i 8, ii.g. (Text-tigs. 4-5). 



Characters iiiterinediate between those of the Australian irenus 

 Sf/iitheinis and the Chilian genus Gomphontacrontia (G. paradora 

 Br.). Wings with the venation more open than usual in the 

 former, but denser than in the latter. Median space with one 

 cross-vein in all four wings; submedian with three cross- veins in 

 fore wing, two in hind wing. In fore wing, the triangle is some- 

 what broader than in SyiUhemis, its basal side being jjlaced at a 

 level about half-way along the hypertrigonal space, as in Gtmi- 

 phomacronda\ the subtriangle is broad, with its posterior side 

 bent: the triangle is follijwed by two rows of post-trigonal cells; 

 M4 and Cuj diverge widely towards the wing-margin. Excess 

 bridge-crossveins pi-esent in both wings. In hindwing, the 

 triangle is longer and much more recessed towards arculus than 

 in Stjafhf'A)us, the basal side of the triangle being placed at a 

 level less than 1 mm. distad from arculus: the subtriangle is still 

 (juadrangular and small. Anal loop of hindwing short, with 

 about ti^ e large cells in male, more in female. Anal triangle of 

 jnale 2-celled, very narnjw, the anal angle very prominent; tlie 

 membranule large. In all four wings, pterostigma weakly braced; 

 Kspl and Mspl not definitely formed. Wings blotched with 

 black at base and upon nodus. 



General facies of the insect resembles that of (xoitiphomacro'iuia 

 pantdoxa Br. Frons prominent and more squarely cut than in 

 Sjjiithenils. Ovipositor of female with valves absent ; the 

 anterior processes fused basally (as in Goniphomacromia), some- 

 what knobbed distally; median processes small, each carrying, 

 projecting from its base, a large tuft of long stiff bristles. (Text- 



fig-5)- 



Larva resembling that of Synfhruiis, but of slenderer build; 

 wing-sheaths divergent: body hairy; teeth of the lateral lobes of 

 the labial mask fairly large. 



Genotype, Synthnuiopsts yotiiphoniacrontidides, n.sp. 



