IMJIAX DllAGUM'LIES. 



610 



Tribe 1. 



-^Villgs uncolourod. 



in 



fore- 

 tlinmgh a 



wing fused shortly, in 

 longer extent. 



Sectors ^>f arc 

 hind-wii 



4, o, 6a slightly convex, running parallel to 

 one another. 



Final antcnodal nervure complete. 



6a often broken. 



7a variable, absent or rudimentary. 



Supernumerary cubital nervures often pre- 

 sent. 



Trigone of hind-wing a little distal to arc 



Tribe 6. — Wings uncoloured or coloured. 

 Sectors of arc as for Tribe 4. 

 4, 6 and 6a variable. 



Final antenodal nervure nearly always in- 

 complete (except Pachydiplax and individ- 

 ual specimens of Acisoma). 

 6a strongly concave to the 6th nervure. 

 7a usually well-lornied. 

 Only 1 cubital uerviire to all wings. 

 Eyes just meeting or only shortly contiguous 



(except Bradinopyga.) 

 Trigone of hind-wing at the arc or a little 



proximal. 

 TentaculiB of male usually bipartite. 

 Vulvar scale usually prominent. 

 1. Lobe of prothorax large, often bilobed and bear- 

 ing a fringe of long hairs, 

 a'. Antenodal nervures numbering less than 

 10^. 

 i^ Abdominal segments 1-6 greatly dilat- 

 ed, the remainder much attenuated.. 

 ii\ Abdominal segments 1-6 not dilated, at 

 least 4 and 6 not dilated, 

 a". Eyes moderately contiguous. 



Discoidal field contracted at termen . . 

 b'-. Ej'^es only just touching. 



Discoidal field dilated at termen 

 b'. Antenodal nervures numbering not less 

 than lOi. 

 The discoidal field commencing with 3 rows 

 of cells, then 2 rows as far as line of 

 bridge 

 ii. Lobe of prothorax small. 



a. Discoidal space much dilated. 



a'. A great develoimicnt of secondary reticul- 

 ation in the wings. 



Wings for the greater pait coloured 

 golden yellow or dark brown 

 b\ No secondary reticulation in the wings. 

 W^ings either not coloured or not so ex- 

 tensively, 

 i'. Eyes broadly contiguous, 



'2 or more rows of cells between 6-6a 

 ii' Eyes moderately contiguous or only just 

 touching. 



Brachydiplax, 



Acisoyna. 



Sympetrum. 

 Diplacodes. 



Rhodothemis. 



Neurothemis. 



Bradinopyga. 



