Rufous-backed Cellophane Bees (Colletes thoracicus) mating. This is one of the 4000+ bees species found in North America; and/or one of approximately 450 species found in NYS; and/or one of around 200 species in NYC.
This female, by the way, has damaged wings.
Just over half of our bees are ground-nesters like the Rufous-backed. About 23% of our bees don’t make nests of any kind: they attempt to grab the nests of others. This cleptoparasitic Nomada bee’s mission is to her lay her eggs inside such ground nests as the cellophane bee’s.
Meanwhile, some not-bees: Narcissus Bulb Fly above, Bare-eyed Mimic Fly below. Your first clue that these these aren’t bees, btw: the very short antennae.
The shape/placement of the eyes and single pair of wings are also telling.
Backyard and Beyond 
Great photos and interesting information. Thank you for your post!