

Left: Northern Checkerspot (Chlosyne palla sterope), male. Osoyoos, BC. 22.V.38 G.S. Walley
Middle: Northern Checkerspot (Chlosyne palla sterope), female. Osoyoos, BC.
Right: Northern Checkerspot (Chlosyne palla calydon), female. Clinton, BC. 18.V.38 J.K. Jacob