Leioproctus kumarina, or Leioproctus (Leioproctus) kumarina, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Terry Houston in 1990.

Etymology The specific epithet kumarina refers to the nearest settlement to the type locality.

Description The female holotype body length is about 8.5 mm, head width 2.45 mm. Integumental colouration is black to dark brown; the hair is white to brown.

Distribution and habitat The species occurs in Western Australia. The type locality is near Kumarina, some 133 km south of Newman, in the Mid West region.

Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Scaevola spinescens.

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