Both sexes of Siricinae are recognized by the fore wing junction of vein Rs originating from vein 1r–rs and ending typically at veins Rs and M (Fig. A3.30).
There are four genera and 64 extant species in the world, and three genera and 18 native species in the Western Hemisphere. Taeger et al. (2010) recognized 7 genera; here we synonymized one of these (Neoxeris) and transferred Sericosoma, Xeris and Neoxeris (a new synonym of Xeris discussed under this genus) to the Tremicinae. All reared specimens (three genera with known hosts) in this subfamily were from conifers.