CROCODILIANS, LIZARDS, AND SNAKES. 1153 



iK(. Three or more loreal scales. 



Rostral plate as wide as high; several smooth plates (m top of muzzle; 

 scales in 23 rows; greenish, with black rings (sometimes), 



interrupted ; no postocular band C. lepidiis Kennicott. 



AA. Nasal jilate sopariited from rostral by small scales. 



Rostral jilate as wide as high ; loreals 2-5; scales of muzzle or of cauthiis not 

 enlarged; tail black-ringed, iiunctulate with black, forming 

 indistinct dorsal spots, which become bands posteriorly. 



C. viitchelUi Cope. 

 III. Top of muzzle with numerous scales; superciliaries produced into a horn like 

 process. 

 Rostral wide as high; muzzle scales smooth above; loreals two; scales in 21 rows; 

 pale, with small dorsal spots and cross bauds cm tail. 



C. cerastes Hallowell, 



The descriptions of the following- supposed species do not coincide 

 with those of any species known to modern naturalists: 



Crotalus dryiniis Linnaei's, Syst. Nat., 1, 1766, p. 372; quoted by Gmelin, Lac^pede, 

 Bonnaterve, Dandin, and Merreni. 



Crotalus horridtis Bodoaeut, Nova Acta, VII, 1783, j). 16; (quoted by Gmelin and 

 Le Conte. 



The following names refer to species which I can not identify with 

 or distinguish from known species either on account of want of speci- 

 mens, imperfect descriptions, or references which can not be unraveled. 



Crotalus adamanteus Jan, Rev. et Mag. Zool., 1859, p. 153. 



Crotalus atricandatus Merrem, Syst. Amphib., 1820, p. 157. 



Crotali(8 eiimanensis Humboldt, Humboldt and Bonpland, Recueil L'Observ., 

 1833, p. 6. 



Crotalus durissus Boddaert, Nova Acta, VII, 1783, p. 16. — Mkukem, Syst. Amphib., 

 p. 157, var. a Gmelin, Syst. Nat., I, 1788, p. 1081. 



Crotalus exalbidus Boddaert, Nova Acta, VII, 1783, p. 16. 



Crotalus horridus Jan, Rev. et Mag. Zool., 1859, p. 153. 



Crotalus rhombifer Merrem, Syst. Amphib., -p. 157. 



Caudisona orienialis Laurenti, Synops., 1768, p. 94. 



Crotalus strepitana Daudin, V, 1802, p. 318; "Said to bo Boa cavina." — Gray, 

 Synops. Kept., p. 78. 



Caudisona ()rouorii LauRENTI, Synops., p. 94; perhaj)S Lachesis mutus Daudin. 



Uropsophus triseriatus Wagler, Nat. Syst. Amph., 1880, j). 176. — Gray, Cat. Snakes 

 Brit. Mus., p. 116; perhaps Caudisona luoifer. — Jan, Icon. Gen. Ophid., j). 29, places 

 this specimen in Crotalus {Sistrurua). 



The following supposed species, according to Boie,' is Tropidono- 

 tus quincimciatus with a crepitaculum of a rattlesnake attached: 



Crotalus tcsselatus Hermann, Observat. Zool., 1804, p. 271. 



The following si)ecies are not rattlesnakes: 



Crotalus mutua Linn.eus, Syst. Natune, 12th ed , 1766, p. .373, and Gmelin Linnaus' 

 Syst. Nat., 13th ed., 1788, p. 1882, is Lacheaia mutus Dacdin. 



Crotalus jfiacivorua LACKi'i'.DE. Serp., II, 1789, pp. 130, 424 ( = 6*. a^uaticus Shaw, 

 Gen. Zool., Ill, 1802, p. 425), is Ancistrodon piacivorua. 



' Isis von Oken, 1827, p. 562. 

 NAT MUS 98 73 



