Pachyprosopis melanognathus, or Pachyprosopis (Parapachyprosopis) melanognathus, is a species of bee in the family Colletidae and subfamily Euryglossinae. It is endemic to Australia. It was described by Australian entomologist Elizabeth Exley in 1976.
Etymology The specific epithet melanognathus refers to the black mandibles.
Description The holotype male body length is about 4.6 mm, wing length 2.9 mm; female allotype body length 4.9, wing length 3.4 mm. Integumental colouration is mainly black with yellow, reddish and brown markings; the hair is sparse and white to brown.
Distribution and habitat The species occurs in the tropical Top End of the Northern Territory. The type locality is Nourlangie Creek, 8 km east of Mount Cahill.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eucalyptus species.
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