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Doryctes leucogaster · brakonidas

It is not Atanycolus https://bugguide.net/node/view/155956: The form of the first antennal segment (scape) is distinctive for the genus, being sharply excavated at both base and apex.

Head round, black. Thorax black; scutum smooth and shiny. Abdomen yellow. Ovipositor black, 1.3-1.4 times as long as abdomen. Fore and middle thighs and shins black, hind thighs and shins black or yellow with black tips. Antennae black, long and multi-segmented – consist of 54 segments (in female). Wings strongly darkened.

There are many similar yellow-abdomined braconids, my ID can be wrong.