Alfalfa-pollinator
Guides
Heterostylum robustum
bomber fly
Heterostylum robustum is a parasitic bee fly (Diptera: Bombyliidae) commonly known as the bomber fly. It is a significant parasitoid of ground-nesting bees, particularly the alkali bee Nomia melanderi, an important pollinator of alfalfa in western North America. The species exhibits sexual dimorphism and has a complex life cycle involving active larval host-seeking behavior and overwintering underground. Its parasitic strategy involves launching eggs into host nests rather than direct contact with hosts.
Megachile perihirta
Western Leafcutter Bee, Western leafcutting bee
Megachile perihirta, commonly known as the Western Leafcutter Bee, is a solitary bee native to western North America. It is an important pollinator of alfalfa and other crops, recognized by its distinctive leaf-cutting behavior where females cut circular pieces from leaves to line nest cells. The species nests in pre-existing cavities in soil, sand, gravel, or rotting wood, and carries pollen on a scopa located on the underside of the abdomen rather than on the hind legs.