xrv] CLASSIFICATION 269 



This well-marked tribe includes two series : 



Series 1. Neurocordulia-Series. Forewing with Jf 4 and (7% slightly 

 divergent. 



Series 2. Cordulia-Series. Forewing with Jlf 4 and Cu convergent. 



Subfamily 2. Libellulinae. 



Triangle of forewing usually excessively narrowed. Anal border of hind- 

 wing rounded in both sexes. Anal loop present, very variable. Eyes globular. 

 No tibial keel on forelegs. Anal appendages of male only slightly differentiated 

 in the different species, but the genitalia of seg. 2 very highly differentiated. 

 Auricles absent. Abdomen mostly relatively short, broad and distended. 

 Body-pattern in males mostly unicolorous, rarely metallic. Larva with the 

 lateral lobes of the mask with very shallow crenulations (exc. Tribe 1 and 

 Pantala) ; legs usually short. 



Tribe 1. Tetrathemini (fig. 130). 



Triangle of forewing nearly equilateral, or with costal side broken. Sectors 

 of arculus united for a long distance, and then separating sharply at an acute 

 angle. Mspl absent or rudimentary. Arc. usually distad from Ax v Base 

 of hindwing narrow ; anal loop reduced, small or absent. Small weak forms 

 with a primitive black and yellow body-pattern. Larva (Nannophlebia) with 

 lateral lobes of mask moderately crenate (as in Eucorduliini). 



Fig. 130. Wings of Tetrathemis cladophila Tillyard, <J, Queensland. 

 (Hw. 21 mm.) Original. 



Tribe 2. Libellulini (figs. 131, 155, 175). 



Triangle of forewing with postal side considerably shortened, rarely 

 broken; followed by two or more rows of post-trigonal cells. Forewing 

 with st well-developed. Anal loop variable, often with outer angle projecting 

 far beyond level of triangle. Sectors of arculus shortly united (exc. Libellula). 

 Numerous Ax in forewing, last one usually complete. Female mostly with 

 very small valvula vulvae, and lateral edges of seg. 8 frequently widened. 

 Larva with comparatively elongated abdomen, hairy ; head squarish in front, 

 with eyes at antero-lateral angles (fig. 36 F). 



