6. Wing venation of an Odonat.
7. Wing venation of a Cicada.
Abbreviations are as follows:
C. Costa, except in figure 1, where on the outer margin C occurs instead of Cu. In the cells it means Costal.
Sc. Subcosta, when it refers to a vein and subcostal in a cell.
R. Radius, when it refers to a vein and radial when in a cell.
M. Media, when it refers to a vein and median in a cell.
Cu. Cubitus, when it refers to a vein and cubital in a cell.
A. Anal veins or cells.
c-v. cross-vein.