Recent work shows that the species as currently described does not form a monophyletic group and its taxonomy and phylogenetic relationship should be re-examined.[3]
References
^Hopper, K.R.; Cutinot, D.; Chen, K.; Halbert, S.E.; Kazmer, D.J.; Mercadier, G.; Miller, R.H.; Pike, K.S. & Tanigoshi, L.K. (1996). "Exploration for natural enemies to control Diuraphis noxia in the United States". Symposia Proceedings of the Entomological Society of America, Lanham, MD.