The helenae species group may be characterized by the following combination of characters: spermatheca S-shaped, capsule pipe-shaped and consisting of a small cylindrical apical part angularly connected with a narrow, tubular and sinuate stem (Figs 153, 161); median lobe of aedeagus with narrowly triangular apical portion of tubus in lateral view (Figs 148, 156); male tergite 8 truncate and slightly emarginated medially (Figs 151, 159); and female sternite 8 deeply emarginated medially (Figs 155, 163).
Species included: G. helenae Casey, and G. canadensis Klimaszewski sp. nov.