a.c 



CL.C C 



n. 



nr. 



_^^ s>> '^ 



IVa. 



IVb. 



Fig. 20. Wings of Dragonflies. 

 Anisopterids. la. Front wing, Ib. Hind-wing, of an Msclina. 



II. Front wing of a Libellula. 

 Zygopterids. III. Wing of Galopteryx <f . IV a. Front wing, 



IV b. Hind- wing, of an Agrion. 

 a.c. Antecubital nervures (transverse bars). c. Cubital point. 



m. Accessory membrane. n. Node (thick transverse vein). 



n.s. Nodal sector. p.c. Post-cubital nervures (transverse bars). 



pt. Pterostigma. t. Triangle. 

 Only those veins and cells referred to in the text are named. 



L. 8 



