I'm seeing these regularly this summer in our old neighborhood. We've lived here since 1983; previously I'd never seen one of these unmistakable butterflies north of the Golden Gate.
Quite small, perhaps 10mm.
On 9/27 I saw a Largus nymph at this spot; 10 days before saw these mature specimens in the same place... coincidence?
Seen this day at the fine old barn with a satyr comma that appeared to be laying eggs. Intended for a heartbeat to examine the foliage for these; but thought better of it...
Saw 4 of these 4-5 cm. beetles on this busy trail on a foggy afternoon.
Very large fly? Big as a bumblebee.
Lots of these today in the higher portions of this park.
Not impressive in flight: looks like a dull-grey day flying moth.
This year I've seen 5 or 6 of these up here; this is as close as I've gotten with a camera...
Sold widely as an excellent nectaring plant... I find that it demands a lot of water or it will promptly wither; and sadly, doesn't really seem so attractive to local butterflies. Perhaps others have had more luck.