Eristalinae are one of the four subfamilies of the fly family Syrphidae, or hoverflies. A well-known species included in this subfamily is the dronefly.
Species in this subfamily are often misclassified as bees instead of flies due to their exceptional Mimicry, especially to resemble Honeybees. Wikipedia
Monoceromyia is a genus of hoverfly. Species in the genus are found in the Afrotropical, Australasian, Neotropical and Oriental regions. They are mimics of wasps and the genus is distinguished by the metapleura being widely separate behind the hind coxae. Wikipedia
Location: Dairy Farm Nature Park – Dec 2021
Thanks Kam-Yung Soh Bees & Wasps of Singapore for the ID