Биология гнездования Ancistrocerus nigricornis (Curtis, 1826) (Hymenoptera: Vespidae: Eumeninae) в Крыму

Abstract

Ancistrocerus nigricornis has three generations in Crimea. The impregnated females hibernate. In Fabretype beehives A. nigricornis occupy tubes various by length and diameter. Nests contain from 3 to 19 cells. In half of the nests female cells were found only. In the nests with the mixed structure the female cells precede cells with males. A part of the nests (10 %) contained only male cells. Common sex ratio in the nests was close to equilibrium (78 ♀♀ : 74 ♂♂). Into future female cells twice more food has been loaded. At transition to male cells sharp reduction of cell length was marked. According to the nest elements weighting a graphic model of the nest structure and content was constructed. The data on chronometry of separate nest building and cell providing acts were resulted. Melittobia acasta Walker and Chrisis cerastes Abeille were marked as nest parasites.