Ptilothrix is a genus within the tribe Emphorini of the family Apidae (bumblebees, euglossines, honeybees, stingless bees). Bees of this genus can range from 7 to 15 mm (0.28 to 0.59 in). Ptilothrix species are solitary, ground-nesting bees. These bees have especially prominent hairs in the scopae of their hind legs, to help gather pollen to provision their nests. Ptilothrix species specialize on certain families of plants for their pollen, including the families Malvaceae, Convolvulaceae, Onagraceae, Cactaceae, Pontederiaceae, and Asteraceae. The genus is found in the New World, with species ranging across the Americas.

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