Yadav R. P., Chaudhary J. P., 1988: Untersuchungen zu den konbinierten Auswirkungen von konstanter Temperatur und Luftfeuchtigkeit auf die Nachwuchsproduktion und das Geschlechterverhältnis von Cheiloneurus pyrillae Mani, einem Eiparasiten von Pyrilla perpusilla Walker. 6 pp. (in English). [HYM 4390] Beiträge zur Entomologie 38: 233-238.

 Yager K., Rozen J. G., 1966: Preliminary systematic study of the pupae of andrenid bees (Hymenoptera, Apoidea). 13 pp. 

 Yamagishi K., 1980: A new species of Trichacoides from Japan (Hymenoptera, Platygastridae). 5 pp. Kontyu, Tokyo 48(1): 95-99.

 Yamagishi K., 1990: Notes on Archiphanurus minor (Watanabe) (Hymenoptera, Scelionidae). 4 pp. 

 Yamagishi K., 2004: Generic composition of Scelionidae (Hymenoptera) in agricultural lands. 16 pp. (in Japanese). [53404] Japanese Journal of Entomology (N. S.) 7(2): 39-54.

 Yamaguchi T., 2005: Influence of urbanization on ant distribution in parks of Tokyo and Chiba City, Japan II. Analysis of species. 9 pp. Entomological Science 8(1): 17-25.

 Yamaguchi T., 2006: Population recovery and spatial dynamics of colony recruitment in a harvester ant: a case study in a park. 8 pp.  Entomol. Sci. 9(3): 247-254.

 Yamamoto S., Hosoishi S., 2010: New records of a tropical fire ant, Solenopsis geminata (Hymenoptera: Formicidae), collected on a regular line ship „Ogasawara-maru“. 3 pp. (in Japanese). Japanese Journal of Entomology (N.S.) 13(3-4): 133-135.

 Yamane S., 1995: On some Taiwanese and Ryukyu Scoliinae (Hymenoptera, Scoliidae). 8 pp. [53898] Journal of Taiwan Museum 48(1): 39-46.

 Yamane S., 1996: The genus Discoelius Latreille (Hymenoptera, Eumenidae) in Taiwan. 15 pp. [HYM 7235] Journal of Taiwan Museum 49(2): 111-115.

 Yamane S., Aibek U., 2012: Distribution of Myrmica species (Hymenoptera, Formicidae) in Mongolia. 15 pp. (in English). Japanese Journal of systematic Entomology (N.S.) 18(1): 171-185.

 Yamane S., Gusenleitner J., Menke A. S., 1996: Pachodynerus nasidens (Latreille) (Hymenoptera, Vespoidea), and adventive potter wasps new to Japan. 5 pp. 

 Yamane S., Kanda E., 1979: Notes on the hibernation of some vespine wasps in northern Japan (Hymenoptera: Vespidae). 4 pp. Kontyu, Tokyo 47(1): 44-47.

 Yamane S., Kojima J. I., 1982: Pseudonomadina new genus, with a description of a new species from the Philippines (Hymenoptera, Trigonalidae). 6 pp. 

 Yamane S., Makino S., Ban T., Sato Y., 1979: Protective suits against hornets. 2 pp. Kontyu, Tokyo 47(3): 429-430.

 Yamane S., Makino S., Macfarlane R. P., 1981: Embryo nest architecture in three Vespula species (Hymenoptera, Vespidae). 7 pp. Kontyu, Tokyo 49(3): 491-497.

 Yamane S., Mateus S., Hozumi S., Kudo K., Zucchi R., 2009: How does a colony of Apoica flavissima (Hymenoptera: Vespidae, Epiponini) maintain a constant temperature 5 pp. (in English). Entomological Science 12: 341-345.

 Yamane S., Tano T., 1995: The Ryukyu species of the genus Cerceris (Hymenoptera, Sphecoidea, Philanthidae). 11 pp. Japanese Journal of systematic Entomology (N.S.) 1(1): 11-21.

 Yamane S., Tano T., 1995: The Ryukyu species of the genus Cerceris (Hymenoptera, Sphecoidea, Philanthidae). 12 pp. 

 Yamane Sk., Yamane S., 1975: A new Trigonalid parasite (Hymenoptera, Trigonalidae) obtained from Vespula nests in Taiwan. 7 pp. Kontyu, Tokyo 43(4): 456-462.

 Yamasaki K., Takahashi J., Okabe K., Makino S., Tsuchida K., 2010: The first record of Sphexicozela sp. (Acari: Winterschmidtiidae) phoretic on the paper wasp, Polistes snelleni (Hymenoptera: Vespidae). 3 pp. (in Japanese). Japanese Journal of Entomology (N.S.) 13(3-4): 126-128.

 Yamazaki K., Matsumoto R., 2009: Predation on the woodwasp Tremex longicollis Konow (Hymenoptera: Siricidae) and its parasitoid Megarhyssa jezoensis (Matsumura) (Hymenoptera: Ichneumonidae) adults during oviposition. 3 pp. Journal of Asia-Pacific Entomology 12(4): 313-315.

 Yamazaki k., Sugiura S., 2002: Occurrence and a new host record of Pediobius franternus (Motschulsky) (Hymenoptera: Eulophidae) in Japan. 2 pp. (in Japanese). [HYM 5038] Japanese Journal of entomology. (N. S.) 5(4): 155-156.

 Yang S., Wei J., Yang S., Kuang R., 2011: Current status and future trends of augmentative release of Aphidius gifuensis for control of Myzus persicae in China’s Yunnan Province. 13 pp. (in English). Journal of the Entomological Research Society 13(3): 87-99.

 Yarpuzlu F., Öztemiz S., Karacaoglu M., 2008: Natural enemies and population movement of the California red scale, Aonidiella aurantii Maskell (Homoptera: Diaspididae) with efficiency of parasitoid, Aphytis melinus (How.) (Hymenoptera: Aphelinidae) in lemon orchards. 16 pp. Journal of the Entomological Research Society 10(1): 43-58.

 Yarpuzlu F., Öztemiz S., Karacaoglu M., 2008: Natural enemies and population movement of the California red scale, Aonidiella aurantii Maskell (Homoptera: Diaspididae) with efficiency of parasitoid, Aphytis melinus (How.) (Hymenoptera: Aphelinidae) in lemon orchards. 16 pp. Journal of the Entomological Research Society 10(1): 43-58.

 Yarrow I. H. H., 1939: The aculeate Hymenoptera of a small isolated sand patch in dorset. 2 pp. 

 Yarrow I. H. H., 1941: Melitta leporina (Panz.) and Nomada flavopicta (Kirby) (Hym., Apidae). 2 pp. [M43] 

 Yarrow I. H. H., 1954: Application for the re-examination and rephrasing of the decision taken by the international commission regarding the name of the type species of „Formica“ Linnaeus, 1758 (Class Insecta, order Hymenoptera). 5 pp. 

 Yarrow I. H. H., 1954: Formica exsecta Nylander (Hym., Formicidae) in the British isles. 3 pp. 

 Yarrow I. H. H., 1955: Andrena combinata Christ (Hym., Apidae): a bee new to Britain. 2 pp. [M43] 

 Yarrow I. H. H., 1955: Bombus (Alpinobombus) hyperboreus clydensis, n. ssp. From baffin Island, north-west territories, Canada. 2 pp.  

 Yarrow I. H. H., 1955: The type species of the ant genus Myrmica Latreille. 3 pp. 

 Yarrow I. H. H., 1967: On the Formicidae of the Azores. 9 pp. 

 Yarrow I. H. H., 1971: The author and date of certain subgeneric names in Bombus Latreille (Hymenoptera: Apidae). 3 pp. 

 Yarrow I. H. H., 1977: Notes on British bumblebees. 2 pp. 

 Yashiro N., Hirose Y., Honda J. Y., Takeuchi Y., Yashiro T., 2012: A new species of from Japan, with comments on its phylogeny and male wing polymorphism. 8 pp. Entomological Science 15(2): 189-196.

 Yasumatsu K., 1939: The genera Nitela and Rhinonitela of Nippon (Hym., Larridae). 2 pp. 

 Yasumatsu K., 1945: Vespoidea of Micronesia 2 (Hymenoptera). 11 pp. 

 Yasumatsu K., 1951: A new Dryocosmus injurious to chestnut trees in Japan (Hym., Cynipidae). 5 pp. 

 Yasumatsu K., 1952: The occurrence of the orussid genus Ophrynella Ross in New Guinea (Hymenoptera: Orussidae). 5 pp. 

 Yasumatsu K., 1953: Sphecoidea of Micronesia. 4. Revision of the genus Pison spinola. Part 1 (Hymenoptera: Sphecidae). 18 pp. 

 Yasumatsu K., 1954: Orussus boninensis, a new species of Orussidae from the Bonin Islands (Hymenoptera). 4 pp. 

 Yasumatsu K., 1955: On the bee fauna of the Bonin Islands. 5 pp. 

 Yasumatsu K., 1955: Taxonomic notes on three wireworm parasites of the genus Pristocera from the far east (Hymenoptera: Bethyloidea). 17 pp. 

 Yasumatsu K., 1956: Two new species of Roproniidae (Hymenoptera). 6 pp. 

 Yasumatsu K., 1958: A new addition to the genera of the Sclerogibbide (Hymenoptera). 5 pp. 

 Yasumatsu K., 1958: A new species of the genus Ropronia from Saghalien (Hymenoptera, Roproniidae). 3 pp. 

 Yasumatsu K., 1960: Notes on two species of Japanese Bethyloidea (Hymenoptera). 6 pp. 

 Yasumatsu K., 1960: The identity of Paralipsis enervis (Nees) and P. eikoae (Yasumatsu) (Hym., Aphidiidae). 2 pp.