AQUATIC INSECTS IN THE ADIRONDACKS 



433 



t. V 



-^A 





^/-^-C 



^^^v 



Fig. 8 Group recognition characters for dragon fly nymphs. B and D, labium and end of abdo- 

 men of Anax Junius Dru. (Aeschninae) A and C, labium and end of abdomen of Perithemis 

 domitia Dru. (Libellulinae) 



€%fi^: 



Fig. 9 The wings of Gomphus descriptus Banks. Ccosta; Scsubcosta ; J? radius ; 7?.s radial sector ; jl/medlaJ 

 Cw cubitus; 4 anal vein; n nodus ; ?»• bridge; o oblique vein ; s>i subnodus ; sf stigma : orarculus; ^triangle; 

 V subtriangle ; s supratriangle : m raembranule. Branches of media, cubitus and anal vein membered at tlie wing mar- 

 gin. The dotted line in the base of the subcostal space Indicates the position of the basal subcostal cross vein when 

 dereloped. 



