Lasius-americanus
Guides
Microdon ruficrus
spiny-shield ant fly
An uncommon syrphid fly of the eastern United States and adjacent Canada. Adults are metallic greenish or bluish black with distinctive cupreous thoracic stripes and a spiny scutellum. Larvae develop within nests of the ant Lasius americanus. The species is one of approximately 6,200 described syrphid flies worldwide.