widely dist. across NA, most common in sw US -
Map (1)(4)(5), cosmopolitan
(6)
The fact that the species is listed as having a "cosmopolitan distribution" and "migrant" by some and that it occurs in places like "Africa, Asia, Europe, Australia, Hawaii, Midway Atoll, Mexico to South America, and the West Indies"
(1) makes me somewhat inclined to disagree that the species is native in Canada and the continental US. This is definitely an interesting biogeographic anomaly. Maybe it should be considered a "cryptogenic" species (species of uncertain origin) in North America. --E.R. Hoebeke, pers.comm. to =v=