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A new species,    Gelis   timarchae    Schwarz, Shaw &amp; Kan, is figured and described from specimens reared as a solitary endoparasitoid of fresh eggs of    Timarcha   nicaeensis    in the south of France. Oviposition behaviour of the adult parasitoid, directly into the host cytoplasm, is described and links to videos are given. This appears to be the first record of any ichneumonid developing as an endoparasitoid of an insect egg, and it is a major departure from hitherto known ectoparasitoid (or spiders’ egg-predation) behaviour in the genus    Gelis   . Fluid from the host egg issuing from the base of the parasitoid’s ovipositor early in the oviposition process is interpreted as a necessary reduction of hydrostatic pressure before the parasitoid egg can be forced down the ovipositor. The egg and first instar larva are figured; the latter is caudate, with the caudal appendage very unusual in being bifurcate. The complex phenology and diapause of the parasitoid were investigated partly experimentally; it is broadly bivoltine with a prepupal diapause in summer, but extra generations and prolonged diapause were both also seen.

journal of hymenoptera research

The remarkable biology of a new species of    Gelis    Thunberg, 1827 (  Ichneumonidae  ,   Phygadeuontinae  ), a solitary endoparasitoid of fresh eggs of    Timarcha    (  Coleoptera  ,   Chrysomelidae  )