Hylaeus nubilosus is a species of insect within the genus Hylaeus.[1] It is commonly referred to as the cloudy masked bee.
Hylaeus nubilosus is a medium-sized (6–9 mm) masked bee with a conspicuous yellow thoracic badge in the middle of the scutellum and metanotum.[2]
Endemic to the eastern States of Australia. It is also recorded from several suburban sites in the Perth region of southwestern Western Australia.[2]
Hylaeus nubilosus prefers to nest in abandoned nests of mud-dauber wasps such as Sphecidae and potter wasps Eumeninae.[2]