This skipper is a southern species that occasionally strays north and has been seen in one southernmost county in Michigan and one in Wisconsin. In Illinois, this species has only been seen in twelve counties, all in the southern part of the state. However, this species is fairly nondescript and could easily be overlooked.
Weekly sightings for Swarthy Skipper
Above, this species is dark brown, with no markings. Below, the Swarthy Skipper is a much lighter yellowish brown with somewhat lighter veins.
In Butterflies through Binoculars: The East, Jeff Glassberg writes that this species could be confused with a worn Tawny-edged Skipper if seen from below. From above, I believe that it could also be confused with a Dun Skipper, so any identification of this species should include good looks at this species from both above and below.
Roadsides, old fields, and savannas.
This species has two broods farther south and strays may occur in either brood, so they could potentially be seen from late May to late August.
A rare stray in Wisconsin.