Abstract
Chrysidid wasps can be considered the most abundant and sometimes the most important enemies of eumenine wasps. We investigated the nesting biology of 36 species of Eumeninae in Crimea (47% of the Crimean fauna) in 2002–2013. As a result we found 15 species of chrysidid wasps (Chrysis cylindrica, Ch. rutilans, Ch. splendidula, Ch. graelsii, Ch. valesiana, Ch. brevitarsis, Ch. ignita, Ch. impressa, Ch. longula, Ch. pseudobrevitarsis, Ch. ruddii, Ch. sexdentata, Ch. ambigua, Ch. taczanovskii, and Stilbum calens) associated with 16 species of hosts of the subfamily Eumeninae. Thus, 13 new host-parasite associations were discovered and 8 previously known ones were confirmed by direct rearing of chrysidids from the nests of eumenine wasps. The data on the host of Chrysis ambigua were obtained for the first time, and the species itself was recorded for Eastern Europe for the first time. Most of the revealed chrysidid wasps develop as inquilines in the nests of eumenines. The reports by early authors of bees as hosts of these chrysidid species are disputable. At least one of the species reared, Stilbum calens, developed as an orthoparasite in the nests of eumenine wasps.
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