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Megascolia procer

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Megascolia procer

Megascolia procer is a solitary wasp in the family Scoliidae found across Asia. It is one of the largest wasps in the world, with a wingspan of 11.6 cm (4.6 in).

M. procer is a large tropical wasp with a body length of 46–77 mm (1.8–3.0 in). 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. The wings are brown with blue iridescent reflections. This structural coloration is because the wing is made of chitin, made dark with melanin, and covered with a transparent overlayer 286 nm (1.13×10−5 in) thick that acts as an interference thin film.

The nominate subspecies has a broad range across the continent of Asia, including records in Indonesia, Malaysia, Singapore, Malaya, Thailand, Myanmar, and India. There are also subspecies found in Sumatra, Java, and Borneo.

The species is a parasitoid of the scarabaeid Atlas beetle, Chalcosoma atlas. 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.

There are four subspecies of M. procer:

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