Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) Records from locations in central and southern U.S. states, south to Mexico. Fewer and more scattered locations than M. QUINQUEMACULATA (Smith, 1995), although the two are about equally frequent in much of the eastern USA. It ranges over most of the United States and is represented in Central and South America by several subspecies or local races (Holland, 1915). Also, scattered records from ND, NE, OK, TX, CO, NM, ID, UT, NV, OR, and Mex. (Smith, 1995). Adults may be found flying throughout the year in southern Florida, elsewhere it is mainly a summer to early fall species. It is most common along the Gulf Coast, up through the Mississippi Valley and along the East Coast to Maryland and New Jersey. It reaches the southeastern part of New York, Connecticut and southeastern Massachusetts. Pupae can survive winters in New Jersey and Connecticut (Schweitzer, 2006) and the species appears to be resident virtually to its northeastern limit. It occurs somewhat sporadically in southern Ontario, the southern half of the Lower Peninsula of Michigan and probably occurs west into Minnesota and might not be winter-hardy in those areas. It has been taken in the mountains of southern Arizona but not in the higher regions of the Coconino Plateau, perhaps because of the shortness of the growing season in the latter area. It occurs in southern California and north into the San Joaquin Valley (Hodges, 1971).
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