Ctenocolletes smaragdinus is a species of bee in the family Stenotritidae. It is endemic to Australia. It was described in 1868 by English entomologist Frederick Smith.
The body length of males is 14âÂÂ16 mm; that of females 17âÂÂ19 mm. It is distinguished from its congeners by its brilliant metallic green integument and sparse pubescence.
The species occurs in south-western Western Australia. The holotype was collected at Champion Bay. Flowering plants visited by the bees include Leptospermum, Melaleuca, Grevillea, Verticordia and Baeckea species.
The adults are solitary, flying mellivores that nest in burrows dug in soil; the larvae are sedentary.