The Baltimore Checkerspot is typically 1.7 inches to 2.9 inches (44mm to 76mm) in size and has the following descriptors / identifiers: rows of white spots; orange bottom spots; orange rim border; large orange spots by head; black center; flying; black; orange; white.
Territorial Area Map (Visual Reference Guide)
The map below showcases (in blue) the states and territories of North America where the Baltimore Checkerspot may be found (but is not limited to). This sort of data can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America.