XVIII LIST OF ILLUSTRATIONS. 



Page. 



315. Trimorpbodon upsilou Cope. Mexico : 1105 



316. Sibou septentrionale Keuuicott. Matamoras, Tamaulipas, Mexico 1108 



317. Scolecophis iomulus Cope. Batopilas, Chihuahua 1109 



318. Tantill a gracilis Baivd and Givard. Dallas, Texas 1112 



319. Tantilla uigriceps Kennicott. Dallas, Texas 1113 



320. Tautilla coronata Baird aud Girard. Mississippi 1114 



321. Elaps fulvius LiuuiXMis. South Carolina 1120 



322. Elaps fulvius Linuieus 1121 



323. Elaps distans Kenuicott 1124 



324. Elaps euryxauthus Kenuicott. Fort Whipple, Arizona 1125 



325. Aiicistrodou piscivorus Lacepede 1134 



326. Aucistrodou coutortrix LinUtTUS 1136 



327. Sistrurus miliarius Linnanis. Volusia, Florida 1141 



328. Sistrurus catenatus edwardsii Baird and Girard. Wichita, Texas 1145 



329. Sistrurus cateuatus catenatus Rafinesque 1146 



330. Crotalus molossus Baird aud Girard : 1154 



331. Crotalus basiliscus Cope. Colima, Mexico 1157 



332. Crotalus adamanteus scutulatus Kennicott. Fort Buchanan, Arizona 



(Tucson) 1159 



333. Crotalus adamanteus adamanteus Bcauvois. Gainesville, Florida 1162 



334. Crotalus adamanteus atrox Baird aud Girard. Brown County, Texas . .. 1165 



335. Crotalus ruber Cope. Southern California 1168 



336. Crotalus conriuentus conlluentus Say. Western Texas 1171 



337. Crotalus coniluentus pulverulentus Cope. Lake Valley, New Mexico 1174 



338. Ci'otaius conlluentus lecontoi Hallowell. Rush Lake, Utah 1175 



339. Crotalus conlluentus lucifer Baird andGirard. San Francisco, California. 1177 



340. Crotalus polystictus Cope. Guanajuato, Mexico 1180 



341. Crotalus tigris Kennicott. Sierra Verde, New Mexico 1181 



342. Crotalus horridus Liuuivus. Kansas 1186 



343. Crotalus enyo Cope. Cape St. L.ucas, Lower California 1189 



344. Crotalus lepidus Kennicott. Rio Grande, Texas 1191 



345. Crotalus mitchellii Cope. La Paz, Lower California 1194 



346. Crotalus mitchellii Cope. Angel Island Bay, Lower California 1195 



347. Crotalus cerastes Hallowell 1197 



