Cooper, J. G. 1860. Report upon the reptiles collected on the survey. Explorations and Surveys for a Railroad from the Mississippi River to the Pacific Ocean. Volume 12, Book 2, Part 3, No. 4: vii–viii, 292–306. Note (DRF): This publication is a word-for-word reprint of Cooper, 1859, Nat. Hist. Washington Terr.: 292–306.. Washington, D.C.