Trichocolletes gelasinus is a species of bee in the family Colletidae and the subfamily Colletinae. It is endemic to Australia. It was described in 2012 by Australian entomologists Michael Batley and Terry Houston.
Etymology The specific epithet gelasinus (Latin: 'dimple') is an anatomical reference to the apex of the male flagellum.
Description The body length is about 13–14 mm. The eyes are not hairy. Colouration is mainly black and orange-brown, with broad white metasomal bands, and with orange and white hair.
Distribution and habitat The species occurs in coastal south-western Australia. The type locality is Neerabup National Park, 38 km north-north-west of Perth.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Daviesia divaricata, Daviesia physodes, Daviesia quadrilatera and Hardenbergia comptoniana.
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