1. Distally, the vannal veins are either simple or branched. 2. Distally the vannal veins are either simple or branched. 3. In the cicada the vannal fold lies immediately behind the first vannal vein ( lV ). 4. In the cicada, the vannal fold lies immediately behind the first vannal vein ( lV ). 5. Some of the vannal veins may be branched, and secondary veins may alternate with the primary veins. 6. The vannus is bordered by the vannal fold, which typically occurs between the postcubitus and the first vannal vein . 7. In Plecoptera the vannal fold is posterior to the postcubitus, but proximally it crosses the base of the first vannal vein . 8. In number the vannal veins vary . from 1 to 12, according to the expansion of the vannal area of the wing. 9. The true jugum of the acridid wing is represented only by the small membrane ( Ju ) mesad of the last vannal vein . 10. In number, the vannal veins vary from one to 12, according to the expansion of the vannal area of the wing.
