We have a melon plant growing in our backyard. It is currently flowering and attracting many pollinators.

I believe that these are wasps:

Of course, there are many bumblebees with a strange ability to remain off-focus:

I am totally unfamiliar with the next insect, perhaps it is a Lapland syrphid fly?


I found interesting information here:
http://www.pollinationcanada.ca/ and http://queenbeejan.com/kindsbee.htm