2008 October 1, Kim Timmermann, Michael Kuhlmann, “Redefinition of the Southern African Bee Subgenera Patellapis (s. str.), P. (Chaetalictus) and P. (Lomatalictus) (hymenoptera: Halictidae, Genus Patellapis Friese, 1909)”, in Journal of the Kansas Entomological Society, volume 81, number 4, page 357