Krombein K. V., 1969: Life history notes on some Egyptian solitary wasps and bees and their associates (Hymenoptera: Aculeata). 18 pp.  Smithsonian Contributions to Zoology

 Krombein K. V., 1969: A revision of the Melanesian wasps of the genus Cerceris Latreille (Hymenoptera: Sphecidae). 36 pp.  Smithsonian Contributions to Zoology

Krombein K. V., 1970: Behavioral and Life-History Notes on Three Floridian Solitary Wasps (Hymenoptera: Sphecidae). 26 pp.  Smithsonian Contributions to Zoology

Kenk R., 1977: Freshwater triclads (Turbellaria) of North America, IX: The genus Sphalloplana. 38 pp.  Smithsonian Contributions to Zoology

Krombein K. V., 1979: Biosystematic studies of Ceylonese wasps, V: A monograph of the Ampulicidae (Hymenoptera: Sphecoidea). 29 pp.  Smithsonian Contributions to Zoology

Krombein K. V., 1981: Biosystematic studies of Ceylonese wasps, VIII: A monograph of the Philanthidae (Hymenoptera: Sphecoidea). 75 pp.  Smithsonian Contributions to Zoology

Kensley B., Walker I., 1982: Palaemonid shrimps from the Amazon basin, Brazil (Crustacea: Decapoda: Natantia). 28 pp.  Smithsonian Contributions to Zoology

Krombein K. V., 1983: Biosystematic studies of Ceylonese wasps, XI: A monograph of the Amiseginae and Loboscelidiinae (Hymenoptera: Chrysididae). 79 pp.  Smithsonian Contributions to Zoology

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

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., 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., 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

Kenk R., 1989: Revised list of the North American freshwater Planarians (Platyhelminthes: Tricladida: Paludicola). 10 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., 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