These line drawings show the important body parts used in the key (modified with permission from Noyes & Valentine 1989 Fauna of New Zealand Series 18, Chalcidoidea).
This is intended to be a very basic guide to the body plan. Within this generalised plan there are many variations of shape.
In females, egg-laying device, but in some Hymenoptera it is modified for stinging (e.g. bees), protected by a pair of ovipositor sheaths
Click to enlarge