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 China W. E., 1964: Opinion 694. Cynips caricae Linnaeus, 1762 (Insecta, Hymenoptera): validated under the plenary powers. 2 pp. 

 Chiri A. A., Legner E. F., 1982: Host-Searching Kairomones Alter Behavior of Chelonus sp. nr. curvimaculatus, a Hymenopterous Parasite of the Pink Bollworm, Pectinophora gossypiella (Saunders). 4 pp. 

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 Chmurzynski J. A., 1964: Studies on the stages of spatial orientation in female Bembex rostrata (Linné 1758) returning to their nests (Hymenoptera, Sphegidae). 30 pp. 

 Chmurzynski J. A., 1967: On the role of relations beetween landmarks and the nest-hole in the proximate orientation of female Bembex rostrata (Linné) (Hymenoptera, Sphegidae). 34 pp. 

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 Chobaut A., 1895: Étude sur les Macrosiagon Hentz (Emenadia Lap.-Cast.) de la région Méditerranéenne. I. – Moeurs et métamorphoses des Macrosiagon. 3 pp. 

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 Church N. S., 1955: Hormones and the termination and reinductin of diapause in Cephus cinctus Nort. (Hymenoptera: Cephidae). 31 pp. 

 Church N. S., 1955: Moisture and diapause in the wheat stem sawfly, Cephus cinctus Nort. (Hymenoptera: Cephidae). 13 pp. 

 Cinovskij J. P., 1959: Osobennosti processa obrazovanija jajcekletok u ryžego pililščika. 21 pp. 

 Cinovskij R. J., 1959: Bolšoj jablonnyh semjaed (Callimome druparum Boh.) kak vreditel semjan bojaryšnikov. 10 pp. 

 Cirelli K. R. N., Braga S. M. P., 2002: New species of Pseudognaptodon Fischer (Hymenoptera: Braconidae: Gnamptodontinae) from Brazil. 7 pp. [HYM 4533] Zoologische Mededelingen 76(9): 89-95.

 Claridge M. F., 1959: A new species of Trichogrammatid (Hymenoptera, Chalcidoidea) parasitic in mirid eggs (Hemiptera - Heteroptera). 4 pp. 

 Clark A. H., 1936: The nest of odynerus tempiferus var. macio bequaert, with notes on the habits of the wasps. 7 pp. 

 Clark A. H., Sandhouse G. A., 1936: The nest of Odynerus tempiferus var. macio Bequaert, with notes on the habits of the wasps. 7 pp. 

 Clark W. H., 1983: Cicada nymphs, Okanagana sp. (Homoptera: Cicadidae), in nests of the owyhee harvester ant, Pogonomyrmex owyheei (Hymenoptera: Formicidae) in Idaho with a note on mound rebuilding by Pogonomyrmex. 4 pp. Journ. of the Idaho Academy of Science 19 (2): 29-32.

 Clément E., 1938: Opuscula Hymenopterologica I. Die Ophioninen-Gattungen Pyracmon Hlgr. und Rhimphoctona Foerst. (Ichneumonidae, Ophioninae.). 29 pp. 

 Cobelli R., 1887: Gli imenotteri del Trentino notizie preliminari. Fascicolo I. Formicidae. 8 pp. 

 Cobelli R., 1890: Gli Apidi pronubi della Brassica oleracea L. 4 pp. [M45]