Campsomeriella collaris is a wasp which belongs to the the family Scoliidae.
Scoliid wasps are a family of beetle hunters. 
They are large, rather hairy solitary wasps.
The female digs in soil, finds a beetle grub, stings it, and lays an egg on it. 
The young eats the beetle grub.

This is a female Campsomeriella collaris collaris which subspecies is distinguished by the white hairs behind the head.
For comparison, the female of the subspecies Campsomeriella collaris quadrifasciata has red-brown hairs behind the head.

Ben Tre area, Mekong Delta, Vietnam, 23December 2023