LeConte, J. L. (1857). Report upon the Insects collected on the survey. Explorations and surveys for a railroad route from Mississippi river to the Pacific Ocean. – War Department. Route near the forty-seventh and forty-ninth parallels, explored by I. I. Stevens, governor of Washington Territory, in 1853–’55. Zoological Report. 12:1-72 (37-42). http://www.archive.org/stream/economicrailroad12secrrich#page/37/mode/1up