Horae zoologicae. Zur vaterländischen Naturkunde ergänzende, sachliche und geschichtliche Bemerkungen - Leydig, Franz, 1821 -1908 (G. Fischer, 1902)

The Horticulturist and journal of rural art and rural taste (Luthur Tucker, 1857)

Hospicidal behavior of the cleptoparasitic wasp Sapyga luteomaculata and investigation into ontogenetic changes in its larval anatomy (Hymenoptera, Vespoidea, Sapygidae) - Kamel, Soliman M. (American Museum of Natural History, 2009)

Humboldt; Monatsschrift für die gesamten Naturwissenschaften - Damer, Otto, 1839 -1916 (F. Enke, 1885)

Hymenoptera ... - Morley, Claude 1874 -1951 (Taylor and Francis; [etc., etc.], 1897)

The Hymenoptera Aculeata of the British Islands : a descriptive account of the families, genera, and species indigenous to Great Britain and Ireland, with notes as to habits, localities, habitats - Saunders, Edward, 1848 -1910 (Reeve, 1896)

Hymenoptera. Haütfluger - Peters, Wilhelm C. H. (Wilhelm C. Hartwig), 1815 -1883 (1862)

Hymenoptera of America north of Mexico : synoptic catalog - Krombein, Karl V. (U.S. Dept. of Agriculture, 1951)

Hymenoptera of America north of Mexico : synoptic catalog, first supplement - Krombein, Karl V. (U.S. Dept. of Agriculture, 1958)

Hymenoptera of America north of Mexico : synoptic catalog, second supplement - Krombein, Karl V. (U.S. Dept. of Agriculture, 1967)