wing venation hoverfly

http://www.microscopy-uk.org.uk/mag/artmay07/cd-hoverflies.html
"... To confirm an insect is a Hover one of the most characteristic features of hoverflies is the presence of a longitudinal false vein in the wing if an examination of wing veins is necessary. In Hovers a great part of the edge of the wing is without veins. The vein running all the way to the edge in most flies ( Radial), only reaches the last transverse vein, not the edge in hover flies upper outer cross vein (A) and lower outer cross vein. Another feature of hover flies is the so-calles 'floating vein' (B). This vein just ends nowhere. Usually veins end either at the edge of the wing or in another vein. Both these features being present means you are actually looking at a hover fly."