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

E. C.  Alfonsus and Braun, E., ?Preliminary studies of the internal structures of Braula coeca Nitzsch?, Annals of the entomological Society of America, vol. 24, pp. 561-582, 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.

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.

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.

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