Hylaeus callosus is a species of bee in the family Colletidae and subfamily Hylaeinae. It is endemic to Australia. It was described by British-American entomologist Theodore Dru Alison Cockerell in 1910.
Description Male body length is about 6 mm. Integumental colouration is mainly black, with yellow markings.
Distribution and habitat The species occurs in Victoria. The type locality is Port Phillip.
Behaviour The adults are flying mellivores.
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