Great job !
For the longest time, I thought these were some sore of stinging bee.
The ones I have been seeing and photographing don't have the reddish coloring; I haven't yet processed any of the images; maybe the reds will show up when I process them --- but I don't remember seeing it on the actual creatures.
At least around here, I didn't see any until mid-July and they disappeared by mid-August.
Now, about the extension tube --- I am assuming Manual Focus only, right ?