The Nyviph. 41 



h. Abdomen much move elongate ; mask 

 Hattened (excejit Curdtilegaster] ; eyes 

 larger, rounded, consjiicuous ; legs 

 shorter than abdomen ^ESCHNID.K. 



Body long and slentler ; abdomen gradually 

 tapering posteriorly, and ending in three 

 caudal appendages. \_Zyi!;optcrides.~\ Agrionid.i-;. 



II.— Table of Sub-Families. 



[Family LIBELLULID.E.] 



Head squarish ; antennx" seven-jointed ; abdo- 

 men sometimes not truncate posteriorly ; mid- 

 dorsal line sometimes but slightly hooked . . LiBELLULlN/K. 

 Head pentagonal ; abdomen truncate pos- 

 teriorly ; mid-dorsal line strongly hooked ; 

 antenna; seven-jointed, long CORDULIIN.E. 



[Family .ESCHXID.F;.] 



Antennx' four-jointed and llattened ; fore- and 



mid-legs with tarsus two-jomtcd GoMPHiN,*;. 



Antennae filiform and seven-jointed ; all legs 

 with tarsus three-jointed. 



a. Mask spoon-shaped CoKDULEGASTERlN.Ti. 



b. Mask flattened ^^SCHNlN.li. 



[P^amily AGRIOXID.F.] 



Antennae with basal joint very long ; legs of 

 inordinate length ; middle caudal appendage 

 lamellar and short, outer ones three-edged ; 



mask bilobed Calopterygin.i:. 



Antennae with joints not conspicuously un- 

 equal ; legs of moderate length ; all caudal 

 appendages lamellar and equal ; mask tlat and 

 somewhat triangular Agrionin.Ii. 



III. — Table of Species. 



libellulid.f;. 



A. Abdomen without lateral spines, or nearly so ; 

 body hairy. 



I. Abdomen broad, obscurely mottled. 



a. Very hairy ; legs short ; head narrow ; 

 eyes pointing backwards diagonally ; 



