An examination of additional specimens of Crotalus lepidus from western Durango and the adjacent parts of Sinaloa and Nayarit have demonstrated the validity of Klauber's (1956) suggestion that a new subspecies may occur. The new subspecies (C. l. maculosus) is described and compared to other subspecies.
Tanner, Wilmer W.; Dixon, James R.; and Harris, Herbert S. Jr.
"A new subspecies of Crotalus lepidus from western Mexico,"
Great Basin Naturalist: Vol. 32
, Article 2.
Available at: http://scholarsarchive.byu.edu/gbn/vol32/iss1/2