Trichocolletes macrognathus 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 macrognathus (Greek: 'large jaw') is an anatomical reference.
Description The body length is about 12–14 mm. The eyes are not hairy. Colouration is mainly black and orange-brown, with broad gold metasomal bands, and with golden and white hair.
Distribution and habitat The species occurs around Geraldton in Western Australia. The type locality is 13 km south of Wanoo.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Malleostemon roseus, Thryptomene hyporhytis, Prostanthera wilkieana and Baeckea species.
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