Harris's Checkerspot (Chlosyne harrisii)
Perth, ON 2018/06/10
Kazabazua, QC 2011/06/10
Arden, ON 2015/06/15
Ottawa, ON 2012/06/06
Member of Family: Nymphalidae
French common name: Damier de Harris
To see where this butterfly has been reported, visit: The Ontario Butterfly Atlas Online
The image at bottom left illustrates the extreme variability in the extent of the orange/black markings that is sometimes seen in this species. As far as I can tell, this is neither sexual dimorphism nor regional variation. The individual at top right is a more or less typical individual, which falls midway between those two extremes.
A guide to distinguishing this species from Silvery Checkerspot based on the dorsal view can be found on this page.