[2] M. procer is a large tropical wasp with a body length of 46–77 mm (1.8–3.0 in).

[2] The body is primarily black with yellowish markings on the front and vertex of the head, pronotum, scutellum, metanotum, medial spot on the first gastral tergite, and a pair of anterolateral spots on the third gastal tergite.

[3] The nominate subspecies has a broad range across the continent of Asia, including records in Indonesia, Malaysia, Singapore, Malaya, Thailand, Myanmar, and India.

The wasp paralyzes a beetle grub with its sting, then lays an egg on it and buries it in an underground cell.

When the wasp larva hatches, it consumes its still-living host before pupating inside its remains.