L.  Oken, ?Systematische Beschreibungen.. [Book review of Meigen]?, Isis (Oken's), vol. 24, pp. 622-627, 1931.

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.

F.  Hendel, ?Kritische und synonymische Bemerkungen über Dipteren?, Verhandlungen der Zoologisch-botanischen Gesellschaft in Wien, vol. 81, pp. 4-19, 1931.

F.  Hendel, ?Neue ägyptische Dipteren aus der Gruppe der acalyptraten Musciden, gesammelt von Prof. Efflatoun Bey?, Bulletin. Société entomologique d'Égypte, vol. 15, pp. 59-73, 1931.

J. R.  Malloch, ?Notes on Australian Diptera. No. xxvii?, Proceedings of the Linnean Society of New South Wales, vol. 56, pp. 60-78, 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.

C. H.  Curran, ?First supplement to the 'Diptera of Porto Rico and the Virgin Islands'?, American Museum Novitates, vol. 456, pp. 1-23, 1931.

J. M.  Aldrich, ?New acalyptrate Diptera from the Pacific and Oriental Regions?, Proceedings of the Hawaiian Entomological Society, vol. 7, pp. 395-399, 1931.

F. X.  Williams, Handbook of the insects and other invertebrates of Hawaiian sugar cane fields. Honolulu, Hawaii: Experiment Station of the Hawaiian Sugar Planters' Association, 1931, p. 400 pp.