614 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXV. 



B. 



i^ Eyes broadly contiguous. 



fetigma large. (2-5-3 mm.) .. 

 ii^ Eyes only slightly contiguous or just 

 touching. 

 Stigma small. (2 mm.) 

 X. 8th nervure slightly separated from the 

 posterior angle of trigone. 

 Trigone in fore-wing entire. 

 Sectors of arc in fore-wing long. 

 Abdomen slim and cylindrical. 

 Border of 8th abdominal segment in the 

 female not dilated 

 y. 8th nervure not separated from the poste- 

 rior angle of triangle. 

 Trigone in fore-wing traversed. 

 Sectors of arc in fore-wing short. 

 Abdomen cylindrical and depressed. 

 Border of 8th abdominal segment in the 

 female dilate 1 . . 

 ii. More than 2 rows of cells in discoidal field. 



Not more than 1 cubital nervure in the hind- 

 wing. 



a. Supplementary nervures to bridge 



b. No supplementary nervures to bridge. 

 i^ Eyes broadly contiguous. 



Abdomen slim and narrow. 

 Discoidal field not dilated. 

 X. Arc between antenodal nervures 1-2. 

 2 rows of cells between 5-5a. 

 In the loop, bisected cells at trigone and 

 external angle . . 

 y. Arc between antenodal nervures 2-'j. 

 1 ro>v of cells between .'i-Sa. 

 In the loop, bisected cells at external 

 angle only 

 ii\ Eyes just touching. 



Abdomen broad and depressed. 

 Discoidal field much dilated . . . . • 



Lobe of prothorax large and fringed with lon^r 

 hairs 



II. 



Arc always between antenodal nervures 1-2 

 (except in some species of Newotfiemis). 



Tribe 3.— Wings parti-coloured with black and golden 

 yellow. 

 Sectors of arc of fore-wing shortly fused, oc- 

 casionally separated. 

 Hypertrigoue in fore-wing usually traversed 



many times. 

 Cubital nervures in fore-wiug often nume- 

 rous. 



Occasional supplementary nervures to bridge. 

 Loop large ; its mid-rib nearly straight. 

 The part of costa, lying between node and 



base of wing, markedly indented. 

 Lobe of prothorax large 



Ayvionoptera. 



Amphithemis. 



Lyriothemis. 



Cratilla, 



PvtaDiarcha. 



Lathrecista. 



Libellula. 

 Orthetnan. 



I'cilpopleura. 



