Wing of female of Erioptera (Erioptera) septemtrionis from Alexander and Byers (1981, fig. 63) [1].

References

1. Alexander C.P., Byers G.W.
   (1981) Tipulidae. in: McAlpine J.F. (Ed.), Manual of Nearctic Diptera. Agriculture Canada, Ottawa, pp. 153–190.