XIV] CLASSIFICATION 267 



Tribe 3. Idocorduliini (fig. 127). 



Triangle of hindwing distad from arculus. Median space free. Anal loop 

 never more than two cell-rows wide, variable in length, without a widened 

 "toe." Abdomen usually slender, not markedly corduliform. Flight weak, 

 graceful. Larva (Austrocordulid) short, with hard spiny body, very flat 

 beneath ; short legs ; lateral lobes of mask deeply and irregularly broken 

 (fig. 36 D). 



Fig. 127. Wings of Austrocordulia refracta TUlyard, , Queensland. 

 (Hw. 29 mm.) Original. 



This somewhat heterogeneous tribe includes two series: 

 Series 1. Oxygastra-Series. Forewing with J/ 4 and Cu : parallel (except 

 in Gomphomacromia). 



Series 2. Idionyx-Semes. Forewing with Jf 4 and (7% slightly divergent. 



Tribe 4. Cordulephyini (fig. 128). 



Triangle of hindwing distad from arculus. Costal side of triangles of both 

 fore and hindwing broken. Anal loop reduced to two or three large cells. 

 Hindwing very narrow at base. Reduced forms with zigzag dodging flight ; 

 wings folded vertically over abdomen when at rest. Abdomen narrow, 

 cylindrical. Larva of typical Eucorduline form (fig. 38), but with peculiar 

 long deep narrow incisions on the lower half of the lateral lobe of the mask. 



Tribe 5. Eucorduliini (figs. 129, 173). 



Triangle of hindwing completely recessed to level of arculus. Anal loop 

 elongate, two cell-rows wide at base, and with a more or less distinctly widened 

 "toe" distally; mid-rib well-developed. Abdomen very distinctly corduli- 

 form. Larva with short oval or rounded abdomen, flattened beneath, smooth 

 (cf . fig. 38) ; long legs ; mask with lateral lobes regularly crenated along inner 

 margin. 



