Thyreus ceylonicus is a species of bee belonging to the family Apidae in subfamily Apinae Wikipedia
Thyreus is an Old World genus of bees, one of many that are commonly known as cuckoo bees, and are cleptoparasites of other species of bees, mostly in the genus Amegilla. Wikipedia
Spotted at Dairy Farm Nature Park – June 2021
Thanks Melissa Ong Bees & Wasps of Singapore for the ID
