Melangyna (Austrosyrphus) ambustus is a species of hoverfly found in south-east Australia, mainly New South Wales.
Description The head of M. ambustus is steel-blue, with a dull pale twinge to each side. Eyes are a dark red, abdomen black, legs also black. It is hoary haired over much of its body. Antennae dark, red underneath. Frons weakly dusted.Walker, F. 1852. Diptera. Part III, pp. 157-252, pls. 5-6. In [Saunders, W. W. (ed.)], Insecta Saundersiana: or characters of undescribed insects in the collection of William Wilson Sauders, Esq., F.R.S., F.L.S., &c. Vol. 1. Van Voorst, London. 474 pp.
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