Paus were your bees of the 1950's; or the ones in the tree, slick or 'hairless' as the one in the picture? My uncle had an experience with mean black bees many years ago. Those bees were 'healthy' black in color bees, (with hair), (fuzz), or whatever it is which covers bees, giving them their color. And by the way they were also mean! lol
Phillip