[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.