There is but one species in this Genus to become naturalized, Samia cynthia (aka walkeri), but a few other related taxa, often considered to be ssp. of the cynthia, have been popularized and traded among hobbyists (for details refer to the list below).
Samia cynthia (narturalized populations)
Samia cynthia ricini (syn. Samia ricini, Eri Silkmoth)
Samia cynthia walkeri (syn. Samia walkeri)
6.Samia cynthia ricini (syn. Samia ricini, Eri Silkmoth)
7.Samia cynthia walkeri (syn. Samia walkeri)
Regarding North American records - This taxon has been introduced into the eastern US and Canada from Asia.
There are several taxa frequently reared and traded among hobbyists; however, the cynthia is the only confirmed taxon to become established outside the hobby trade.
Recent records along the Atlantic suggest populations still occur from Virginia to New England.
NOTE - Many of the established populations seem to have disappeared in recent years.
There may be some populations east of Rocky Mountains in eastern United States and southern Canada.(1)
"spotty distribution along the Atlantic coast from Connecticut to Georgia and west to northern Kentucky." BAMONA
There are numerous subspecies and related/similar taxa distributed across Southeast Asia, China, the Indian Subcontinent and the Islands of the Indo-Pacific.
Generally associated with disturbed areas (i.e. urban & suburban environments) of the mid-Atlantic.
The cocoons of the cynthia moth are reported to be commonly seen and collected near bridges and railroads where Ailanthus trees flourish.
Ailanthus, Privet + a few native shrubs and trees
1 to 2 generations per year in the US
The cynthia moth was introduced into the US during the late 1800's in an attempt to generate a silk industry. Both the moth and the host, ailanthus, have become established along the east coast of the US.
Although established, the cynthia moth is not regarded as a significant pest species.