Where their ranges of Common or White Checkered Skippers overlap, these species are indistinguishable except by examining genitalia of males.
Either a white or common checkered skipper, but I've been told it's not possible to distinguish these two from a photo.
Pyrgus is a genus in the skippers butterfly family, Hesperiidae, known as the grizzled skippers. The name 'Grizzled Skipper' best describes this genus, but in some countries the name 'Checkered Skipper' or 'Chequered Skipper' is applied to some species. Strictly speaking, 'chequered skippers' applies to butterflies of the genus Carterocephalus.