Prosena siberita

Prosena siberita can reach a body length of 7.5–10.5 millimetres (0.30–0.41 in). These flies have a grey dusted, fuscous or testaceour body. In males the abdomen is largely testaceous, while in females it is fuscous, densely grey dusted. Thorax shows some yellowish hairs. They have a very long and slender proboscis that they keep hinged under the body. The length of the proboscis is longer than the height of the head. Palpi are highly reduced. Eyes are reddish-brown and bare. Femora are reddish. Wings are hyaline, yellowish-brown at the base.

This species is present in most of Europe, Central Asia, Japan, Mongolia, China, Russia, Transcaucasia, India, Indonesia, Malaysia, Myanmar, Nepal, Philippines, Ryukyu Islands, Sri Lanka, Taiwan, Australia and New Caledonia. It has been introduced and established in United States. The earliest introduction occurred in 1925, when numerous specimens were released in New Jersey for the purpose of establishing a local population to combat the spread of the Japanese beetle.