CROCODILIAN^, LIZARDS, AND SNAKKS. 

 Sistrurus catenatus calenuius liajineaque. 



1149 



Locality. 



Savannah, Georgia 



Delaware County, Iowa 



Nebraska 



New Buttalo. Michigan 



Cohniibua, Ohio 



Warren, Ohio 



Trumbull County, Ohio 



Indiana 



Utah 



Kacine, Wisconsin 



Verilinris Kiver 



Paris, Illinois 



Hamilton ('ounty, Indiana . 

 Central Illinois ' 



From wliom received. 



H. F. Odcll . 

 M. Warner. 



I'rot. L. Lesquereux. 

 i)r. J.'r.'KiVtiaud!".". 



(^apt. J. H. Simpson, U. S. A 



Dr.P.R.Hoy 



J.H.Clark.'. 



O. P. Hay 



do... 



Dr. D. "W. Prentiss 



Nature of 

 specimen. 



Alcoholic, 

 do. 

 do. 

 do. 

 do 

 do. 

 do. 

 do. 

 do. 

 do. 

 do. 

 do. 

 do. 

 do. 



CROTALUS Linnaeus. 



Crotalus Linnaeus, Systema Natur;p, lOtli oil., 1758, ]>. 214; 12th ed., 17tiG, p. 

 572. — Lacepkde, Plistoire Naturelle des Serpens, II, 1789, p. 130 (uot of Liu- 

 nanis). — Daudin, Ilistoire Naturelle des K'eptiles, V, 1802, p. 297. — CuviEi;, 

 Eegne Animal, II, 1817, p. 77. — Wagler, Naturlicb. Syst. der Ampliibien, 

 1830, p. 176. — SciiLEiJEL, Essai sur la Physionomie des Serpens, II, 1887, ]>. 

 555. — Gray, Zoological Miscellany, 1812, p. 51. — Fit/inger, Systema Hei)- 

 tilium, 1843, p. 29.— Gray, Cat. Brit. Mus., 1849, p. 19.— Baird and Giuard, 

 Cat. N. Amer. Kept., Pt. 1, Serp., 1853, p. 1. — Dumeril and Bihuon, Erp. 

 G^n., VII, 1854, p. 1453.— Cope, Bnll. U. S. Nat. Mus., No. 32, 1887, p. 63. 



Catidisona Laurenti, Spec. Syu. Kept., 1868, p. 92. — Cope, Smithsonian Contri- 

 butions to Knowledge, Researches on the Venom of the Rattlesnake, by S. W. 

 Mitchell, M. D., 1860, XII, p. 119. 



V7-02>8()pJii(s Wagler, Natur. Syst. der Amph., 1830, p. 176. — ^Gray, Zool. Misc., 

 1842, p. 51.— FiTziNGER, Syst. Kept., 1843, p. 29.— Gray, Cat. Brit. Mus., 

 1849, p. 19. 



UrocrotaJon Fitzinger, Systema Reptiliuni, 1843, p. 29. 



Urosteges undivided; tail terminating in a jointed rattle. Top of 

 head covered Avitli scales. Body eylindric. 



The above simple diagnosis embraces the characters which distin- 

 guish the genus Crotalus. This type, the most specialized form of the 

 order Ophidia, is chiefly distributed in North America, to which, if we 

 regard the Mexican plateau as a part of it, twelve of the (ifteen si)ecies 

 are restricted. Two species are found in South America, but none 

 occur in the West Indies. Within tbe nearctic region the distribu- 

 tion of species is very unequal. Thus but one species, the C. horridus, 

 is contined to the eastern district. A second, the C. (KhuHaittrn.s, exists 

 in the austroriparian district, but extends itself from this region 

 westward across and throughout the Sonoran district as far as the 

 Pacific Ocean, occupying also the Lower Californiai district. This dis- 

 tribution is only imitated by the Zamenis JhKjclhon among North 

 American reptiles. The Central and Pacific districts are occupied by 

 another species, C. confuentus, which also extends over the northern 

 part of the Sonoran. To the Sonoran district we must go for five 

 species: C molossus, C. tigris, C cerastes, C. lepidiis, and C. pyrrhus, 



