Explanation of Names
Refers to their parasitism of Trachusa (Resin-leafcutter bees)
Numbers
6 spp. in our area, 10 spp. worldwide
(1)Size
Larger than usual for Stelis (Dark bees)
Range
Holarctic: mostly so. US (north to NJ in the east) to Mexico + the Mediterranean
(1)Habitat
In SE USA often Pinewoods. In general, found near nesting and foraging sites of the host Trachusa species
Remarks
Subgenus Heterostelis is parasitic on Trachusa.