First records, phenology, habitat, and host-plant associations of <i>Macrotera opuntiae</i> (Cockerell) (Hymenoptera: Andrenidae) in Montana

Abstract. Macrotera (Cockerellula) opuntiae (Cockerell) is a minute bee oligolectic on cacti and one of the few stone-nesting species. We document first records M. in Montana, USA, considerable range expansion from where this species was previously known Colorado. briefly describe habitat host-plant (cacti) associations, activity period adults Montana. A new state record for Nebraska western Colorado are also reported.