They are shown to have an ovipositor, with which they can lay eggs into a host.
From the en.wikipedia.org
Just to make the point, she sticks out her ovipositor, the organ with which she lays eggs.
From the newscientist.com
With its ovipositor, the wasp pierces the caterpillar's flesh and places a single egg inside.
From the sciencedaily.com
Aphidiinae wasps use an ovipositor at the rear of their abdomen to lay their eggs inside aphids.
From the sciencedaily.com
We're all still neck deep in the stuff her ovipositor excreted.
From the guardian.co.uk
Females typically have a special ovipositor for inserting eggs into hosts or otherwise inaccessible places.
From the en.wikipedia.org
In the more ancestral Hymenoptera, the ovipositor is blade-like, and has evolved for slicing plant tissues.
From the en.wikipedia.org
Ripley destroys most of the eggs, enraging the queen, who escapes by tearing free from her ovipositor.
From the en.wikipedia.org
The female wood wasps of the Siricidae family use a needle-like ovipositor to deposit eggs inside pine trees.
From the newscientist.com
More examples
Egg-laying tubular structure at the end of the abdomen in many female insects and some fishes
The ovipositor is an organ used by some animals for oviposition, i.e. the laying of eggs. It consists of a maximum of three pairs of appendages formed to transmit the egg, to prepare a place for it, and to place it properly. ...
A tubular protruding organ for laying eggs
The egg-laying structure on a reproductive fire ant; functions as a stinger on non-reproductives (worker ants)
External female reproductive organ used to lay eggs.
A specialised organ for depositing eggs in female insects.
The egg-laying apparatus of a female insect.
A modification at the hind end of adult female fly through which the eggs are laid. It can be extended and retracted. A female extends her ovipositor when laying an egg and also when rejecting a male during courtship.
An elongated structure on some female insects that allows the precise placement of eggs.