I'd be happy to help you with this Barry.
I worked in a Toronto band in the 60's 70's and the Black Fly Song was a popular request so it was played regularly in our gigs..
If you go to :
www.chordie.com you can get the lyrics if you look up under "H" for Wade Hemsworth, the composer. They don't provide chords for this tune which is unusual, as I refer to that site frequently for chords, but the ones I used came back to me quickly. I played it in a "C" position with the capo on the second fret.
So starting off it would be:
(C) Twas early in the spring when I decide to go
For to (F) work up in the woods in (G7) North Ontario
The (C) unemployment office said they'd send me through
To the (F) Little Abi-tibi with the (G7) survey crew.
Chorus:
And the (AM) black flies, the little black flies
Always a black fly, no matter where you go
I'll (DM) die with the black fly a-picking my bones
In north On-tar-i-(AM)o-i-o, (E) North Ontari-(AM)-o.
Then to finish the song we would repeat the chorus and on the very last note of
"Ontario" we would finish with a strong strum on the (A Major) chord.
So it would be "North Ontari-(Amajor)-o.
Good luck and make sure it's fun.
Cheers, RJ.