Below Viewing Platform on Burk Trail flying around the colony of Drury's Long-horned Bee (Melissodes druriellus).
Active colony of Drury's Long-horned Bee (Melissodes druriellus) being parasitized by Goldenrod Longhorn-Cuckoo Bee (Triepeolus pectoralis). Last picture appears to show Triepeolus attacking Melissodes.
identified by John S. Ascher at BugGuide. Numerous on sandy areas of old logging road through mixed forest.