56 British Dragonfiics. 



b. Triangle of fore- and hind-wings similar, 

 long axis longitudinal ; males usually 

 with two auricles on segment 2, and the 

 inner margin of hind-wings hollowed . . ^^SCHXID^Tii. 



B. Front- and hind-wings similar in shape, closed 

 vertically in repose (except Lesies, which 

 keeps them partly open) ; no accessory 

 membrane ; males with two inferior anal 

 appendages [zygopteridesJ AGRIOXID^Ti. 



II. — Table of Sub-Families. 



[Family LIBELLULID.F.] 



A. Males without auricles on segment 2, and 



inner margin of hind-wings not hol- 

 lowed ; abdomen never bronze ; anal 

 appendages of male simple; of female 

 short, cylindrical, or spindle-shaped . . Libellulina;. 



B. ]\Iales with auricles on segment 2, and 



inner margin of hind-wings hollowed ; 

 abdomen bronze-green ; anal appen- 

 dages of male elaborate ; of female 

 leaf-like Corduliin.e. 



[Family .FISCHNID.F:.] 



A. Eyes separated from one another ; abdo- 



men without lateral carina; ; females 



without ovipositor Gomphin.i:. 



B. Eyes just meeting at a point ; abdomen 



without lateral carina^ ; ovipositor 



present in female CoRDULEGASTERlN.E. 



C. Eyes in contact on top of head for a 



greater or less distance ; abdomen 

 with lateral carinre ; ovipositor present 

 in female ^'Eschnin.'K. 



[Family AGRIOXID.F.] 



A. Many ante-cubital nervures ; wings 



coloured ; female with white ptero- 



stigma ; male with none Calopterygin.-i:. 



B. Two ante-cubital nervures ; wings stalked 



and uncoloured ; pterostigma present 



in both sexes and coloured . . . . AORIONIN.I';. 



