[1][4][5] It occurs in the western part of North America, from southern Canada through the United States to northern Mexico.

Northern specimens are often mostly black, with ample yellow markings but with the ferruginous (rusty red) colour being very restricted.

[6] In Canada it has been recorded in southernmost areas of the provinces of British Columbia[6] (including southern Vancouver Island),[1] Alberta[1][6] and Saskatchewan.

[1] In the USA it has been recorded in Arizona, California, Colorado, far west North Dakota, western South Dakota, Idaho, westernmost Kansas, Montana, western Nebraska, Nevada, New Mexico, Oregon, far west Texas, Utah, Washington and Wyoming (a single record in the far northwest).

[2] Adults have been seen from January to November in more southern locations such as California or Arizona, from April to October in British Columbia in the north of the range, from April to November in more higher and continental areas such as Colorado, or having an even more restricted season in northern continental areas such as Alberta or Saskatchewan.

[3] It is parasitised upon by the endoparasitoid Xenos peckii and an unidentified Gordius species, a type of horsehair worm.