Callohesma eustonensis is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 1974 by Australian entomologist Elizabeth Exley.
Distribution and habitat The species occurs in south-eastern Australia. The type locality is 32 km east of Euston, New South Wales. It has also been recorded from Wyperfeld National Park in Victoria and Hartley, South Australia.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus species.
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