Hylaeus nubilosus is a species of insect within the genus Hylaeus. It is commonly referred to as the cloudy masked bee.
Hylaeus nubilosus is a medium-sized (6âÂÂ9 mm) masked bee with a conspicuous yellow thoracic badge in the middle of the scutellum and metanotum.
Endemic to the eastern States of Australia. It is also recorded from several suburban sites in the Perth region of southwestern Western Australia.
Hylaeus nubilosus prefers to nest in abandoned nests of mud-dauber wasps such as Sphecidae and potter wasps Eumeninae.