1144 REPORT OF NATIONAL MUSEUM, 1898. 



SISTRURUS CATENATUS Rafinesque. 



Sistrurus catenatus Gauman, N. Aiuer. Kept., 188.>, p. 176. — Hay, Batr. Rept. Indi- 

 ana, 1892, p. 126.— Stejnegek, Report U. S. Nat. Miis. for 1893 (1895), p. 411, 

 pi. V. — BouLEXGEK, Cat. Snakes Brit. Mns., 2d ed., Ill, p. 570. 



Crotalinus catenatus Rafixesque, Anier. Month. Magaz., IV, 1818, p. 41. 



Croialns catenatus Gauman, N. Amer. Rept., 1883, p. 118, pi. ix, fig. 2. 



Croialopliorus catenatus Cope, Proc. U. S. Nat. Mns., XIY, 1892, p. 685. 



Crotalus tergeminns Say, Long's Exped. Rocky Mts., I, 1823, p. 499. — Haklan, 

 Jonrn. Acad. Nat. Sci. Phila., 1827, p. 372. — Dumkhil and Bibron, Krp. 

 Gon., VII, 1854, p. 1480.— Cope, in Mitchell's Venom of the Rattlesnake, 

 Smithsonian Contributions to Knowled,ne, No. 135. 



Crotalophorus tergeminns Gray, Synopsis Reptilinm, 1830, p. 78. — Holhrook, 

 N. Amer. Herpt., Ill, 1842, p. 29, pi. v. — Agassiz, Lake Superior, 1850, p. 381, 

 pi. VI, figs. 6-8. — Baird and Girard, Cat. N. Amer. Rept., Pt. 1, Serp.,1853, 

 p. 14. — WiED, Nova Acta Acad. Leop. Car., 1865, No. 8, p. 74. 



Caudisona teryemina AVagler, Nat. Syst. Amphib., 1830, p. 176; Check-list N. 

 Amer. Batr. Rept., 1875, p. 34. 



Crotalus massasamjus Kirtland, Mather's 2d Report Geol. Surv. Ohio, 1838, p. 190. 



Crotalopliorus kirtlandii Holbrook, N. Amer. Herpt., Ill, p. 31, pi. vi. — Gray, 

 Syn. Reptilium, 1830, p. 78. — Baird and Girard, Cat. N. Amer. Rept., Pt. 1, 

 Serp., p. 16. 



Rostral plate liiglier than wide, with ai^ex not recurved on summit 

 of muzzle, subtruncate, sides coucave, and base not expanded. Povst- 

 uasal and preocular in contact, not separated by the single loreal. 

 Parietal plates smaller than the superciliaries. Scales in twenty-three 

 or twenty-five rows, all keeled, except one inferior on each side, llattle 

 not diminutive. Brown, with a series of darker brown transverse spots 

 on the back, and a single series of smaller brown spots on each side, 

 opposite to each dorsal spot. A light line extends fro)n the postnasal 

 plate below the orbit to the angle of the mouth, and two yellow lines 

 extend to the mouth from the anterior and posterior edges of the max- 

 illary fossa. Thirty-six to forty spots in the median series. 



The scales of this species are generally elegantly wrinkled obliquely 

 toward the keel and the apex. This is best marked in the subsi)ecies 

 edicardsii. 



Two geographical races or subspecies of the JS. catenatus have been 

 described. They differ as lollows : 



Scales in twenty-three rows; colors paler; ilorsal spots narrower; lateral spots 

 smaller S. c. edwardsii. 



Scales in twenty-five rows; colors darker; dorsal spots wider; lateral spots larger 

 S. c. terzeniimis. S. c. catenatus. 



SISTRURUS CATENATUS EDWARDSII Baird and Girard. 



Crotalopliorus edwardsii Baird and Girard, Cat. N. Amer. Rept., Pt. 1, Serp., 1850, 

 p. 15. — Du.MKRiL and Bibron, Erp. Gcu., VII, p. 1483. — Baikd, U. S. and Mex. 

 Bound. Surv., X, p. 15. 



Caudisona edwardsii Cope, Check-list N. Amer. Batr. Rept., p. 34. 



Figures, U. S. Pac. R. R. Expl. Rept., X, Reptiles, pi. xxiv, fig. 8 (loreal plate 

 incorrect) ; U. S. and Mex. Bound. Surv., II,'pl. v, fig. 1. 

 Cauthus rostral is sharply defined ; rostral plate vertical; two pre- 



