Osborn H., 1898. The Hessian fly in the United States. 52 pp. 

 Osten Sacken C. R., 1878: Bemerkungen über Blepahroceriden. Ein Nachtrag zur "Revision" dieser Familie von Professor Dr. Loew. 12 pp. [M42] 

 Osten Sacken C. R., 1882: Diptera from the Philippine Islands. 66 pp. 

 Osten Sacken C. R., 1882: On Professor Brauer’s paper: Versuch einer Charackeristik der Gattungen der Notacanthen. 1882. 18 pp. [M58] 

 Osten Sacken C. R., 1886: Characters of the larvae of Mycetophilidae. 30 pp. [M58] 

 Osten Sacken C. R., 1887: Some North American Tachinae. 6 pp. 

 Osten Sacken C. R., 1887: Studies on Tipulidae. Part II. Review of the published genera of the Tipulidae brevipalpi. 80 pp. 

 Osten Sacken C. R., 1890: Hilarimorpha Schin. ins a Leptid. 2 pp. 

 Osten Sacken C. R., 1891: Additions and corrections to the catalogue of the described species of South-American Asilidae. 12 pp. 

 Osten Sacken C. R., 1891: Synopsis of the described genera and species of the Blepharoceridae. 10 pp. [M58] 

 Osten Sacken C. R., 1895: Contributions to the study of Liponeuridae Loew (Blepharoceridae Loew, olim). 17 pp. 

 Osten Sacken C. R., 1895: Eristalis tenax in chinese and japanese literature. 28 pp. 

 Osten Sacken C. R., 1895: Supplement to my recent paper on Liponeuridae. 32 pp. 

 Osten Sacken C. R., 1895: XIX. Remarks on the homologies and differnces between the first stages of Pericoma, Hal., and those of the new Brazilian species. 5 pp. 

 Osten Sacken C. R., 1896: Bibiliograhische und theilweise psychologische Untersuchung übe die zwei Ausgaben der Erstlingsarbeit von H. Loew: Ueber die Posener Dipteren. 6 pp. 

 Osten Sacken C. R., 1896: Notice on the terms tegula, antitegula, squama and alula, as used in Dipterology. 4 pp. 

 Osten Sacken C. R., 1896: Preliminary notice of a subdivision of the Suborder Orthorrhapha Brachycera (Dipt.) on chaetotactic principles. 12 pp. 

 Osten Sacken C. R., 1897: Identification of two genera of Nemestrinidae. 7 pp. [M40] 

 Osten Sacken C. R., 1902: The position of Phora in the system of Diptera. 2 pp. [M40] 

 Osten Sacken C. R., : Report on the Diptera collected by Lieut. W. L. Carpenter in Colorado during the summer of 1873. 6 pp. 

 Ostroverchova G. P., 1982: Zoogeografičeskaja charakteristika fauny micetofiloidnych komarov Zapadnoj Sibiri. 5 pp. 

 Otter G. W. M. A., 1938: On the morphology of the larvae of three species of Cecidomyidae (Diptera) from knapweed (Centaurea) flowers. 30 pp. The Transactions of the Royal Entomological Society of London 87(2): 39-68.

 Otter G. W., 1934: On the early stage of Lestopdiplosis alvei Barnes (Diptera, Cecidomyidae), especially in relation to the larval head capsule. 12 pp. 

 Otto C.-J., Schiegg K., 1999: Chironomidae (Diptera) collected in the forest reserve Sihlwald ZH, with 21 new records for Switzerland. 9 pp. Mitt. Schweiz. entomol. Ges. 72(1-2): 95-103.

 Ouchi Y., 1939: Contributiones ad cognitionem insectorum Asiae orientalis. VII. A new species of Megarhinus mosquito from Amami-Oshima, the southern Japan. 4 pp. 

 Ouchi Y., 1939: Diptera Sinica. Celyphidae. I. On a new species of genus Spaeniocelyphus from Eastern China. 3 pp. 

 Ouchi Y., 1939: Diptera Sinica. Oestridae. I. On a new genus belonging to subfamily Hypodermatinae. 4 pp. 

 Ouellet J., 1941: Additions au catalogue des Diptéres du Ouébec. 21 pp. 

 Ovazza M., 1956: Contribution a l’étude des Dipteres vulnérants de l’Empire d’Éthiopie. III. Tabanidae. 8 pp. 

 Ovazza M., 1962: Une nouvelle espece de Tabanus (Diptera: Tabanidae) trouvée en AFrique occidentale: Tabanus moreli, n. sp. 6 pp. 

 Ovazza M., Rickenbach A., Hamon J., 1956: Essai de séparation des différentes formes de Tabanus secedens Walker (Diptera: Tabanidae) par l’étude des terminalia femelles. 11 pp. 

 Overgaard Nielsen B., 1971: Some observations on biting midges (Diptera: Ceratopogonidae) attacking grazing cattle in Denmark. 5 pp. 

 Ovtshinnikova O. G., 1983: The functional morphology of the male genitalia of Ptecticus tenebrifer Walker (Diptera, Stratiomyidae) and Solva ussuriensis Pleske (Diptera, Solvidae). 4 pp. (in Russian). 

 Ovtshinnikova O. G., 1986: Musculature of male genitalia in flies of the superfam. Stratiomyioidea (Diptera). 14 pp. (in Russian). Entomologitsheskoe obozrenie 65(2): 280-293.

 Ovtshinnikova O. G., 1987: Musculature of the male genitalia in flies of the family Coenomyiidae and systematic position of this family among the lower Brachycera (Diptera). 9 pp. (in Russian). Entomologitsheskoe obozrenie 66(2): 256-264.

 Ovtshinnikova O. G., 1993: Homologization of the male genital sclerites of the Diptera Brachycera based on the study of the musculature. 10 pp. (in Russian). Entomologitsheskoe obozrenie 72(4): 737-746.

 Ovtshinnikova O. G., 1996: Peculiarities of the structure of male genitalia in some species of hover-flies (Diptera, Syrphidae). 11 pp. (in Russian). Entomologitsheskoe obozrenie 75(3): 542-552.

 Oye P., 1936: Observations sur la biologie des larves de Simulium (Melusina) Diptére. 11 pp. 

 Ozerov A. L., 1983: Notes on Sepsidae (Diptera) of the Far East. 3 pp. (in Russian). Entomologitsheskoe obozrenie 62(3): 635-637.

 Ozerov A. L., 1985: A new and little known species of the Sepsidae (Diptera) from the Far East. 6 pp. (in Russian). Entomologitsheskoe obozrenie 64(4): 839-844.

 Ozerov A. L., 1986: K poznaniju muravjevidok (Diptera, Sepsidae) fauny SSSR. 6 pp. 

 Ozerov A. L., 1986: To the knowledge of Sepsidae (Diptera) of the fauna of the USSR. 6 pp. (in Russian). Entomologitsheskoe obozrenie 65(3): 639-644.

 Ozerov A. L., 1989: Flies of the families Sepsidae and Piophilidae (Diptera) of the Zejskij state nature preserve. 11 pp. (in Russian). Entomologitsheskoe obozrenie 68(4): 839-849.

 Ozerov A. L., 1992: New data on the neotropical sepsids (Diptera Sepsidae). 6 pp. Russian Entomol. J. 1(1): 81-86.

 Ozerov A. L., 1992: The results of the examination of the syntypes of Sepsi insularis Williston, 1896 and Sepsis furcata Melander et Spuler, 1917 (Diptera Sepsidae). 1 pp. Russian Entomol. J. 1(2): 75.

 Ozerov A. L., 1993: Four new synonyms in the family Sepsidae (Diptera). 2 pp. (in Russian). Entomologitsheskoe obozrenie 72(1): 248-249.

 Ozerov A. L., 1993: Six new species of the genus Palaeosepsis Duda (Diptera Sepsidae). 9 pp. Russian Entomol. J. 2(1): 63-71.

 Ozerov A. L., 1995: To the fauna and taxonomy of African Sepsidae (Diptera). 18 pp. Russian Entomol. J. 4(1-4): 127-144.

 Ozerov A. L., 1997: Some types of North American and African species of Sepsidae (Diptera). 4 pp. Russian Entomol. J. 6(1-2): 85-88.

 Ozerov A. L., 1997: Two new species of Sepsidae (Diptera). 3 pp. Russian Entomol. J. 6(3-4): 83-85.