Olmi M., 2004: New species of Dryinidae from Colombia (Insecta, Hymenoptera, Chrysidoidea). 8 pp. Spixiana 27(2): 147-154.

 Olmi M., 2005: A contribution to the knowledge of Dryinidae of the Neotropical and Australian regions (Insecta, Hymenoptera, Chrysidoidea). 10 pp. Spixiana 28(3): 271-280.

 Olmi M., 2008: New species of Dryinidae from the Afrotropical Region (Insecta, Hymenotpera, Chrysidoidea). 7 pp. Spixiana 31(2): 215-221.

 Olmi M., Copeland R. S. Guglielmino A., 2015: An updated checklist of Dryinidae, Embolemidae and Sclerogibbidae (Hymenoptera) of Kenya and Burundi, with descriptions of thirteen new species. 48 pp. Acta Entomologica Musei Nationalis Pragae 55(1): 333-380.

 Olmi M., Currado I., 1974: Studi sui Gonatopodini (Dryinidae) con partiolare riguardo a quelli conservati nel museo civico di storia naturale di Genova. 44 pp. 

 Olmi M., Currado I., 1975: Su alcuni tipi di Dryinidae di Ljungh, Snellen van Vollenhoven a Klug (Bethyloidea). 20 pp. 

 Olmi M., Currado I., 1977: Gonatopodinae extraeuropei conservati nel Museo Civico di Storia Naturale di Genova (Hymenoptera: Dryinidae). 30 pp. 

 Olmi M., Currado I., 1977: On the identity of Gonatopus pedestris Dalman (Hymenoptera: Dryinidae). 3 pp. 

 Olmi M., Currado I., 1979: Revisione del genere Haplogonatopus R. C. L. Perkins (Hymenoptera Dryinidae). 8 pp. 

 Olmi M., Orphanides G. M., 1994: A new species of the genus Aphelopus from Cyprus (Hymenoptera Dryinidae). 6 pp. 

 Olmi M., Orphanides G. M., 1994: A new species of the genus Aphelopus from Cyprus (Hymenoptera Dryinidae). 6 pp. (in English).  Bolletino del Museo regionale di Scienze Naturali – Torino 12(2): 407-412.

 Olmi M., Xu Z., Guglielmino A., 2014: Descriptions of new fossil taxa of Dryinidae (Hymenoptera: Chrysidoidea) from Burmese amber (Myanmar). 12 pp. Acta entomologica Musei nationalis Pragae 54(2): 703-714.

 Olmo J. M., 1991: Estudi preliminar dels ortopters de Menorca. 9 pp. Ses. Entom. ICHN-SCL, Barcelona. 7: 3-11.

 Oloumi-Sadeghi H., Zavaleta L. R., Roberts S. J., Armbrust E. J., Kapusta G., 1988: Changes in morphological stage of development, canopy structure, and root nonstructural carbohydrate reserves of alfalfa following control of potato leafhopper (Homoptera: Cicadellidae) and weed populations. 8 pp. 

 Olsen S. L., 1994: Exploitation of mammals at the early bronze age site of west ron fen (Mildenhall 165), Suffolk, England. 39 pp. Annals of Carnegie Museum 63(2): 115-153.

 Olson C. A., 1994: Floyd Gerald Werner 1921-1992. 12 pp. (in English). Psyche 101(1-2): 1-12.

 Olson L., Violani C., 1995: Some unusual hybrids of Ramphocelus, with remarks on evolution in the genus (Aves: Thraupinae). 16 pp. (in English). Bolletino del Museo regionale di Scienze Naturali – Torino 13(1): 297-312.

 Olson S. L., Violani C., 1995: Some unusual hybrids of Ramphocelus, with remarks on evolution in the genus (Aves: Thraupinae). 16 pp. 

 Olsufiev N. G., 1969: To the taxonomy and distribution of Tabanidae (Diptera) of the Palaearctic region. 7 pp. Acta entomologica Bohemoslovaca 66: 115-121.

 Olsufiev N. G., Leclercq M., 1971: Some problems of the nomenclature of palaearctic Tabanidae (Diptera). 2 pp. 

 Olsufiev N. G., Moucha J., Chvála M., 1964: Chrysozona scutellata sp. n. aus Mitteleuropa (Diptera, Tabanidae). 3 pp. [DIP 2493] Acta Societatis entomologicae Cechosloveniae 61: 284-286.

 Olsufiev N. G., Moucha J., Chvála M., 1967: Zur taxonomie und Verbreitung der europäischen und kleiasiatischen Arten der Tabanus bovinus – Gruppe (Diptera, Tabanidae). 11 pp. Acta entomologica Bohemoslovaca 64: 303-313.

 Olszak R., 1979: Occurrence of gall midges (Diptera, Cecidomyiidae) in aphid colonies on apple trees. 11 pp. (in Polish). [DIP 2495] Polskie Pismo Entomologiczne 49: 185-195.

 Olszanowski Z., 1991: New mites of Holonothrus from Tasmania (Oribatida: Crotoniidae). 12 pp. [ARA 350] [M25] Genus.

 Olszanowski Z., 1994: A new species of Camisia von Heyden from Poland (Acari: Oribatida: Camisiidae). 6 pp. [ARA351] Genus 5(3): 209-214.

 Olszanowski Z., 1996: A monograph of the Nothridae and Camisiidae of Poland (Acari: Oribatida: Crotonoidea). 201 pp. Genus.

 Olszanowski Z., 1997: New oribatid species of the genus Crotonia from Brazil (Acari): Crotonidae). 7 pp. [ARA1698] Genus 8(3-4): 719-725.

 Olszanowski Z., 1997: Trimalaconothrus rafalskii n. sp. – a new oribatid mite species from Poland (Acari: Oribatida: Malaconothridae). 1 pp. [ARA1699] Genus 8(1): 103-108.

 Olszanowski Z., Bromberek K., 2011: Novonothrus lucasi spec. nov., a new moss mite from Australia (Acari: Oribatida: Nothridae). 9 pp. Genus 22(4): 667-675.

 Olszanowski Z., Szywilewska A., Norton R. A., 2001: New moss mite of the Camisia from western Nearctic region (Acari: Oribatida: Camisiidae). 12 pp. (in English). [ARA 1890] [M25] [M26] Genus 12(3): 395-406.

 Olszanowski Z., Szywilewska-Szczykutowicz A., Blaszak C., Ehrnsberger R., 2007: Die Milben in der Zoologischen Staatssammlung München. Teil 10. Überfamilie Crotonioidea (I) (Acari, Oribatida). 9 pp. Spixiana 30(2): 159-167.

 Oman P. W., 1938: Revision of the nearctic Leafhoppers of the tribe Errhomenellini (Cicadellidae). 18 pp. 

 Oman P. W., 1947: The types of auchenorrhyncous Homoptera in the Iowa State College collection. 68 pp. 

 Oman P. W., Beamer R. H., 1944: Some new species of Cuerna (Homoptera – Cicadellidae). 10 pp. 

 Oman P., 1987: The leafhopper genus Errhomus (Homoptera: Cicadellidae: Cicadellinae) systematics and biogeography. 72 pp. 

 Omelko M. M., 1986: A review of gelechiid moths of the genus Parachronistis Meyr. (Lepidoptera, Gelechiidae) with descriptions of new species from the south of Primorye territory. 16 pp. (in Russian). Entomologitsheskoe obozrenie 65(4): 753-768.

 Omelko M. M., 1986: Obzor vyemčatokrylych molej roda Parachronistis Meyr. (Lepidoptera, Gelechiidae) s opisaniem novych vidov iz južnogo Primorja. 16 pp. 

 Omelko M. M., 1991: On the system and morphology of the gelechiid moths of the subfamily Gelechiinae (Lepidoptera, Gelechiidae) with special reference to the fauna of southern Primorye territory. 17 pp. (in Russian). Entomologitsheskoe obozrenie 70(1): 140-156.

 Omelková M., Ježek J., 2012: A new species of the genus Trichomyia (Diptera: Psychodidae) and new faunistic data on non-phlebotomine moth flies from the Podyjí NP and its surroundings (Czech Republic). 29 pp. Acta Entomologica Musei Nationalis Pragae 52(2): 505-533.

 Omer-Cooper J., 1955: Canthyporus lateralis (Boheman) and further new Dytiscidae (Coleoptera) from the cape province of South Africa. 8 pp. 

 Omer-Cooper J., Tottenham C. E., 1934: Coleoptera taken in the air at Wicken Fen. 4 pp. 

 Omoloye A. A., 2010: Effects of genotype variation in the cultivated rice species on the biology and galling characteristics of the African rice gall midge, Orseolia oryzivora (Diptera: Cecidomyiidae). 8 pp. Entomological Science 13(3): 320-327.

 Omoloye A. A., Vidal S., 2007: Abundance of 24-methylenecholesterol in traditional African rice as an indicator of resistance to the African rice gall midge, Orseolia oryzivora Harris & Gagné. 9 pp. Entomological Science 10(3): 249-257.

 Omori M., Vervoort W., 1986: Observations on a living specimen of the giant hydroid branchiocerianthus imperator. 5 pp. Zoologische Mededelingen 60(16): 257-261.

 Omorov E. O., 1975: K ekologii ručeinikov (Trichoptera) gornych potokov Juzhnogo Tjan-Šanja (Na primere fauny r. Ak-Bury). 7 pp. 

 Omorov E. O., Khaitov Kh. Kh., 1992: Vertical distribution of mayflies (Ephemetoptera) in Ak-Bura river and its tributary Kichik-Alai (Alai Range). 5 pp. (in Russian). Entomologitsheskoe obozrenie 71(1): 17-21.

 Omura H., Itoh T., Wright D. M., Pavulaan H., Schröder S., 2015: Morphological study of alar androconia in Celastrina butterflies. 7 pp. Entomological Science 18(3): 353-359.

 Omwega C. O., Overholt W. A., 1996: Genetic changes occurring during laboratory rearing of Cotesia flavipes Cameron (Hymenoptera: Braconidae), an imported parasitoid for the control of gramineous stern borers in Africa. 7 pp. African Entomology 4(2): 231-237.

 Omwega C. O., Overholt W. A., Mbapila J. C., Kimani-Niogu S. W:, 1997: Establishment and dispersal of Cotesia flavipes (Cameron) (Hymenoptera: Braconidae), an exotic endoparasitoid of Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae) in northern Tanzania. 5 pp. African Entomology 5(1): 71-75.

 Ondráček J., Matolín S., 1971: Sterilizing effect of tepa on the bean beetle Acanthoscelides obtectus Say (Coleoptera). 7 pp. Acta Entomologica Bohemoslovaca 68: 209-215.