Pygarctia pterygostigma is a moth in the family Erebidae. It was described by Harrison Gray Dyar Jr. in 1909. It is found in Mexico, and in the United States, in New Mexico and southern Texas.Moth Photographers Group at Mississippi State University
The wingspan is about 28 mm. Adults are on wing from June to September.Bug Guide
References
Arctiidae genus list at Butterflies and Moths of the World of the Natural History Museum