Hey Howie,
Thanks for the tip on High Park, I'll check there on my next visit. Rosetta is the same for me, it's only 10 minutes walk from the house. I was there for a quick walk after dinner tonight and there were a lot of newly emerged Red Admirals flying about but that was it, nuttin' else yet. I'm still in the learning stage when it comes to butterflies so most parks that I'm visiting, I'm visiting for the first time. So far Rouge Park has been amazing with all of it's different habitats but it's a big place as I'm sure you're aware of, lot's of walking. On June 4th I saw my very first ever Milbert's Tortoiseshell there and then on June 8th I saw 2 more together in a completely different spot, not bad for a 'rare' Toronto butterfly. Any of the parks along the Scarborough Bluffs can produce some terrific finds at any given time, as with the birds, it seems to be a natural migration route for butterflies as well. As far as White Admirals and Red-spotted Purples, they usually just like to taunt the heck outta me, they fly by close to say 'hello' and then up towards the trees they go outta sight. I was extremely fortunate at Rouge Park to stumble on a pair (one of each) that were flying around close together and both landed briefly for photos. I haven't been to Lambton Woods/Eglinton Flats in the west end as of yet but have read many great reports from there, also, East Point Park here in Scarborough looks like another really good spot to check. Good luck at the Spit, let us know what you find.
Walter