Krombein K. V., 1984: Biosystematic studies of Ceylonese wasps, XII: Behavioral and life history notes on some Sphecidae (Hymenoptera: Sphecoidea). 30 pp. Smithsonian Contributions to Zoology

 Krombein K. V., 1984: Biosystematic studies of Ceylonese wasps, XIII: A monograph of the Stizinae (Hymenoptera: Sphecoidea, Nyssonidae). 37 pp. Smithsonian Contributions to Zoology

 Krombein K. V., 1984: Biosystematic studies of Ceylonese wasps, XIV: A revision of Carinostigmus Tsuneki (Hymenoptera: Sphecoidea: Pemphredonidae). 37 pp. Smithsonian Contributions to Zoology

 Krombein K. V., 1984: Two new egg parasites of South African walking sticks and notes on two previously described specis (Hymenoptera: Chrysididae, Amiseginae). 5 pp. 

 Krombein K. V., 1985: Biosystematic studies of Ceylonese wasps, XV: a monograph of the Alyssoninae, Nyssoninae, and Gorytinae (Hymenoptera: Sphecoidea: Nyssonidae). 43 pp. Smithsonian Contributions to Zoology

 Krombein K. V., 1985: Oxybelus (Anoxybelus) maidlii Kohl, an Oxybelus with unusual features (Hymenoptera: Sphecoidea: Crabronidae). 7 pp. Proc. Entomol. Soc. Wash. 87(3): 634-640.

 Krombein K. V., 1986: Three cuckoo wasps from Siberian and Baltic amber (Hymenoptera: Chrysididae: Amiseginae and Elampinae). 8 pp. Proc. Entomol. Soc. Wash. 88(4): 740-747.

 Krombein K. V., 1987: Synonymic notes on the Bethylidae described by V. de Motschulsky (Hymenoptera: Aculeata). 3 pp. Proc. Entomol. Soc. Wash. 89(2): 356-358.

 Krombein K. V., 1996: Biosystematic studies of Ceylonese wasps, XXI: A revision of the Bethylinae and Epyrinae (Cephalonomiini and Sclerodermini) (Hymenoptera: Bethylidae). 29 pp. Smithsonian Contributions to Zoology

 Krombein K. V., Evans H. E., 1976: Three new neotropical Pterobrus with description of the diapausing larva (Hymenoptera: Tiphiidae). 8 pp. 

 Krombein K. V., Gingras S. S., 1984: Revision of North American Liris Fabricius (Hymenoptera: Sphecoidea: Larridae). 96 pp. Smithsonian Contributions to Zoology

 Krombein K. V., Kurczewski F. E., 1963: Biological notes on three Floridian wasps (Hymenoptera, Sphecidae). 14 pp. 

 Krombein K. V., Kurczewski F. E., 1963: Biological notes on three floridian wasps (Hymenoptera, Sphecidae). 14 pp. 

 Krombein K. V., Mello J. F., Crockett J. J., 1974: The North America Hymenoptera Catalog: A Pioneering Effort In Computerized Publication. 6 pp. 

 Krombein K. V., Norden B. B., 1995: Notes on the behavior and taxonomy of Megachile (Xeromegachile) brimleyi Mitchell and its probable cleptoparasite, Coelioxys (Xerocoelioxys) Galactiae Mitchell (Hymenoptera: Megachilidae). 4 pp. 

 Krombein K. V., Pulawski W. J., 1986: Biosystematic studies of Ceylonese wasps, XVI: A revision of Gastrosericus Spinola (Hymenoptera: Sphecoidea: Larridae). 20 pp. Smithsonian Contributions to Zoology

 Krombein K. V., Pulawski W. J., 1994: Biosystematic studies of Ceylonese wasps, XX: A revision of Tachysphex Kohl, 1883, with notes on other oriental species (Hymenoptera: Sphecidae: Larrinae). 106 pp.  Smithsonian Contributions to Zoology

 Krombein K. V., Vecht J. van der, 1987: Biosystematic studies of Ceylonese wasps, XVII: A revision of Sri Lankan and south Indian Bembix Fabricius (Hymenoptera: Sphecoidea: Nyssonidae). 30 pp. Smithsonian Contributions to Zoology

 Krombein K. V., Walkley M., 1962: Three Hymenopterous parasites of an African mud-dauber wasp, Sceliphren spirifex (L.) (Hymenoptera). 1 pp. 

 Krüger P., : Beobachtungen am Mehlmottenparasiten Nemeritis canescens Gravenhorst, zugleich ein Beitrag zur Kenntnis der äusseren Anatomie der Ichneumoniden. 10 pp. 

 Kruseman G., 1959: Enkele zoögeografische opmerkingen over de hommelfauna van Zweden (Hym., Apid.). 3 pp. 

 Krysinski S., 1957: Uwagi o faunie zadlówek (Hymenoptera, Aculeata) okolic Przemysla. 7 pp. 

 Krzyzynski M., Ulrich W., 2015: Ceraphronidae and Megaspilidae (Hymenoptera: Ceraphronoidea) of Poland: current state of knowledge with corrections to the Polish checklist. 10 pp. Polskie Pismo Entomologiczne 84(3): 191-200.

 Ksentini I., Monje J. C., Jardak T., Zeghal N., 2010: Naturally occurring egg parasitoids of the genus Trichogramma (Hymenoptera: Trichogrammatidae) in a pomegranate orchard in Tunisia. 8 pp. Entomological Science 13(1): 99-106.

 Ku D. S., 1997: A taxonomic study of the genus Streblocera Westwood from Korea (Hymenoptera, Braconide, Euphorinae). 16 pp. [51335, 52673] Insecta Koreana. 14: 65-80.

 Kubes P. A., 1905: Rody kolínských vos a včel. 28 pp. 

 Kubišová S., Haslbachová H., 1978: Effects of larval extracts on the development of ovaries in caged worker honey bees. 6 pp. Acta entomologica Bohemoslovaca 75: 9-14.

 Kubišová S., Haslbachová H., Vrkoč J., 1982: Effects of fractions of larval extracts on the development of ovaries in caged worker honey bees. 7 pp. Acta entomologica Bohemoslovaca 79: 334-340.

 Kučera M., Madziara-Borusiewicz K., 1982: Proteolytic inhibitors, proteases and haemocyte changes in diapausing and diseased larvae of Cephalcia falleni (Hymenoptera, Pamphiliidae). 5 pp. Acta entomologica Bohemoslovaca 79: 401-405.

 Kudo K., Ishiguro N., Tsuchida K., Tsujita S., Yamane S., Zucchi R., 2005: Polymorphic microsatellite loci for the swarm-founding wasp polybia paulista (Hymenoptera: Vespidae). 3 pp. Entomological Science 8(1): 5-7.

 Kudô K., Komatsu K., Konishi K., Mateus S., Zucchi R., Nascimento F. S., 2013: Bionomic notes on Pachysomoides sp. (Hymenoptera: Ichneumonidae), a parasitoid of the Neotropical social wasp Polistes satan Bequaert (Hymenoptera: Vespidae). 3 pp. Entomological Science 16(3): 360-362.

 Kudo K., Yamane S., Miyano S., 1996: Occurrence of a binding matrix in a nest of a primitively eusocial wasp, Eustenogaster calyptodoma (Hymenoptera, Vespidae). 5 pp. 

 Kudô K., Zucchi R., 2006: Effect of a foreign male’s age on acceptance into a conspecific colonyin a Neotropical wasp. 3 pp. Entomological Science 9(4): 355-357.

 Kudome S., 1978: A wild bee survey in Kôchi Plain (Kôhi Pref.), Shikoku, Japan (Hymenoptera, Apoidea). 25 pp. Kontyu, Tokyo 46(3): 512-536.

 Kugler C., 1992: Stings of ants of the Leptanillinae (Hymenoptera: Formicidae). 13 pp. 

 Kugler H., 1938: Sind Veronica chamaedrys L. und Circaea lutetiana L. Schwebfliegenblumen 19 pp. 

 Kugler H., 1952: Die spontane bevorzugung bestimmter Farbqualitaeten durch blütensuchende Insekten. 10 pp. 

 Kugler H., 1962: UV-Musterungen auf Blüten und ihr Zustandekommen (Kurzgassung). 6 pp. 

 Kugler H., 1971: UV-Musterungen bei Alpenblumen. 7 pp. 

 Kugler H., 1971: Zur Bestaeubung grossblumiger Datura-Arten. 7 pp. 

 Kugler H., 1973: Zur Bestaeubung von Scaevola plumieri (L.) Vahl und Ipomoea pes-caprae Sweet, zwei tropischen Strandpflanzen. 11 pp. 

 Kugler J., 1981: A new species of Cataglyphis Förster (Hymenoptera: Formicidae) from Israel and Sinai. 6 pp. Israel Journal Ent. 15: 83-88.

 Kugler J., 1983: The males of Cardiocondyla Emery (Hymenoptera: Formicidae), with the description of the winged male of Cardiocondyla wroughtoni (Forel). 21 pp. Israel Journal Ent. 17: 1-21.

 Kugler J., 1986: The Leptanilliane (Hymenoptera: Formicidae) of Israel and a description of a new species from India. 13 pp. Israel Journal Ent. 20: 45-57.

 Kugler J., Soussan O., 1992: Redescription and biological observations on Leptothorax flavispinus André (Hymenoptera: Formicidae). 5 pp. Israel Journal Ent. 26-27(1991-1992): 209-213.

 Kühlhorn F., 1961: Über das Verhalten sozialer Faltenwepsen (Hymenoptera: Vespidae) beim Stalleinflug, innerhalb von Viehställen und beim Fliegenfang. Untersuchungen über die Insektenfauna von Räumen (5). 18 pp. 

 Kühlhorn F., 1964: Über das Einflug- und Raumverhalten von Ephialtes punctulatus Ratz. (=extensor Tasch., Hymenoptera, Ichneumonidae) im Bereich von Scheunen und Viehstaellen. Untersuchungen über die Insektenfauna von Raeumen: 12. 15 pp. 

 Kuhlmann M., 1997: Zum taxonomischen Status von Nomada goodeniana (Kirby, 1802) und Nomada succincta Panzer, 1798 (Hymenoptera, Apidae). 8 pp. Entomofauna 18/32: 521-528.

 Kuhlmann M., 2002: Struktur der Wildbienen und Wespenzönosen ausgewählter Waldstandorte im Nationalpark Bayerischer Wald (Hymenoptera, Aculeata). 14 pp. [52782] Nachrichtenblatt der Bayerischen Entomologen 51(3-4): 61-74.

 Kuhlmann M., 2013: Eupetersia avontuurensis nov. sp., first record of the bee Genus in the South African winter rainfall region (Hymenoptera, Apoidea, Halictidae). 8 pp. (in English). Entomofauna 34/14: 185-192.