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Dietz 1891:209. Hab.--California, Montana, Wyoming.
The three preceding species are very closely related, but more extensive series are necessary, to prove them as mere variations of one species. Two specimens in Dr. Horn's collection, from Montana, which I refer to the present species, show a decided similarity to Bolteri in the less coarsely punctured, elytral striae, more convex eyes, less conspicuous pubescence and larger size.
Hatch 1971:346. A. confusus Dietz, in key to species of the A. suturalis group. Recorded from se B.C., e Wn., Id., Or.