4 BULLETIN 17 5, UNITED STATES NATIONAL MUSEUM 



case, a key is given in the accompanying text. The numbers on the 

 ordinate in every case represent the characters. At the top of each 

 graph the number of specimens from each locaHty is given. 



The color patterns were drawn free-hand, but scale by scale, from 

 typical specimens. When the pattern of the form illustrated is more 

 or less uniform throughout, a single drawmg of an area just anterior 

 to the middle of the body was made to represent the form, as in the 

 case of affinis. Wiien the patterns of the anterior and posterior parts 

 of the body are noticeably different, as in the case of dejjpei jani, 

 drawings were made from two regions of the same individual, one 

 taken about one-third of the distance from neck to vent, the other 

 about two-thirds of the distance. In a few cases, e. g., lineaticollis, 

 three drawings were made, one each of the anterior, middle, and 

 posterior parts of the body of a single individual. 



ABBREVIATIONS USED IN THE TEXT 



Throughout this bulletin the following abbreviations are used 

 when reference is made to specimens or collections: 



Ala. Mus.: Alabama Museum of Natural History, University, Ala. 

 A. M. N. H.: American Museum of Natural History, New York. 



A. N. S. P.: Academy of Natural Sciences of Philadelphia. 



B. Y. U.: Brigham Young University, Provo, Utah. 



C. A. S.: California Academy of Sciences, San Francisco. 

 Carnegie: Carnegie Museum, Pittsburgh. 



Clemson: Clemson Agricultural College, Clemson College, S. C. 



Conner: Charles R. Conner Museum of the State College of Washington, 

 Pullman, Wash. 



Field: Field Museum of Natural History, Chicago. 



I. S. C: Iowa State College of Agriculture and Mechanic Arts, Ames, Iowa. 



Klauber: Private collection of L. M. Klauber, San Diego, Calif. 



K. S. A. C: Kansas State Agricultural College, Manhattan, Kans. 



Lewiston: Lewiston State Normal School, Lewiston, Idaho. 



M. C. Z.: Museum of Comparative Zoology of Harvard University, Cambridge. 



M. S. C: Montana State College, Bozeman, Mont. 



M. V. Z.: Museum of Vertebrate Zoology of the University of California, Berke- 

 ley, CaUf. 



Ottawa: Ottawa University, Ottawa, Kans. 



San Diego: San Diego Society of Natural History, San Diego, Calif. 



St. A. C: St. Ambrose College, Davenport, Iowa. 



Stanford: Stanford University, Palo Alto, Calif. 



U. Colo.: University of Colorado, Boulder, Colo. 



U. III.: University of Illinois, Urbana, 111. 



U. Mich.: University of Michigan Museum of Zoology, Ann Arbor. 



U. Okla.: University of Oklahoma Museum of Zoology, Norman, Okla. 



U. Pa.: University of Pennsylvania, Philadelphia. 



U. S. N. M.: United States National Museum, Washington. 



U. Wyo.: University of Wyoming, Laramie, Wyo. 



Viosca: Private collection of Percy Viosca, Jr., New Orleans, La. 



Whitman: Whitman College, Walla Walla, Wash. 



Yankton: Yankton College, Yankton, S. Dak. 



