Mallow-bee
Guides
Ptilothrix
chimney bees, mallow bees
Ptilothrix is a genus of solitary, ground-nesting bees in the family Apidae, tribe Emphorini, with an amphitropical distribution in the New World. These bees range from 7 to 15 mm in body length and are distinguished by prominent, coarse scopae on their hind legs adapted for collecting large-grained pollen. Females excavate nests in hard-packed soil using water carried from ponds to moisten the substrate, constructing distinctive turreted or chimney-like nest entrances. The genus exhibits narrow pollen specialization (oligolecty), with species specializing on particular plant families including Malvaceae, Convolvulaceae, Onagraceae, Cactaceae, Pontederiaceae, and Asteraceae.