For species that have a recurrent humeral vein, the next feature is to look at the crossveins in the apical third of the hind wing (see below image). If the insect has no crossveins, or no more than four. Then you have a representative of the genus Sympherobius (click here). If it has at least five crossveins then see below.
If there are at least five crossveins in the apical third of the hind wing, you next need to look at the number of branches of R and the width of the costal space (see below image). If you have at least five branches or R and a wide costal space then you have the genus Megalomus (click here), if you have three or four branches of R and a relatively narrow costal space (see below).
For the species with three or four branches of R, the next feature to look for is the position of a crossvein RMCV with the fork of M (see below image). If RMCV is pale and before the fork of M, you have a representative of the genus Hemerobius (click here). If RMCV is dark and after the fork of M, you have a representative of Wesmaelius (click here).
