O. H.  Latter, ?Observations on the insect enemies of the British bee _Osmia rufa_ (L.) (Hym.: Megachilidae)?, Proceedings of the Entomological Society of London, vol. 6?, p. 58?, 1931.

W. S.  Bristowe, ?Notes on the biology of spiders. VII. Flies that triumph over spiders?, Annals and Magazine of Natural History, vol. 10, pp. 471-474, 1931.