The first photo is a different individual and a little larger and plumper in the abdomen than the one in shots 2 and 3. I was trying to make it Simosyrphus, but it doesn't have the yellow thorax markings that our photos of that species have, so I'm thinking maybe it is just a different species of Melangyna. The angle isn't good for seeing if it has a 4th pair of yellow spots near the tip of the abdomen as in the individual in shots 2 and 3.