[2] Its wings are transparent, and the body is elongated with a length of 1.4 inches (36 mm).

[4] This species is native to North America including parts of the United States and Canada.

[2] It has also been introduced to Australia, New Zealand, Tasmania, Brazil, and South Africa to help control horntail forest pests.

The female then deposits a very slender egg through its ovipositor into the tunnel on or near the horntail larva.

The M. nortoni larva pupates inside its host and emerges the following summer as an adult.