The fact that these bees are roosting during the day indicates that they are males - the females are too busy to be hanging around like this!
Classification
Species counts from Australian Faunal Directory
Order Hymenoptera - Wasps, Ants, Bees and Sawflies, 12202 named species in Australia
Family Halictidae - Sweat Bees, A Short-tongued Bee family, 384 named species in Australia
Genus Lipotriches
Species Lipotriches australica