Brachyhesma nigricornis, or Brachyhesma (Brachyhesma) nigricornis, is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 1975 by Australian entomologist Elizabeth Exley.
Etymology The specific epithet nigricornis refers to the black antennal flagella of the male.
Description Colouring is mainly yellow. Body length of males is 3.5 mm, wing length 2.1 mm; body length of females is 3.5 mm, wing length 2.4 mm.
Distribution and habitat The type locality is Billiatt Conservation Park in South Australia. It has also been recorded from Mataranka, Northern Territory.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include mallee eucalypts.
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