906 16. CROTALIDM 



Crotalus miliarius var. edwardsii Jan, Elenco Sist. degli Ofidi, 1863, 



p. 124. 

 Crotalus miliarius Jan, Iconogr. Gener. Ophid., 46e livr., 1874, pi. Ill, 



fig. 6. 

 Caudisona edwardsii Cope, Bull. U. S. Nat. Mus., No. I, 1875, P- 345 



Yarrow, Surv. W. looth Merid., Vol. V, 1875, P- 53'; Yarrow, 



Bull. U. S. Nat. Mus., No. 24, 1883, p. 78; Cragin, Trans. Kansas 



Acad. Sci., Vol. VII, reprint 1906, p. 118. 

 Sistrurus miliarius var. edwardsii Garman, Mem. Mus. Compr. Zool., 



Cambr., Vol. VIII, No. 3, 1883, p. 177. 

 Crotalophorus catenatus edwardsii Cope, Proc. U. S. Nat. Mus., Vol. 



XIV, 1892, p. 685; Cope, Proc. Acad. Nat. Sci. Phila., 1892, p. 336. 

 Sistrurus catenatus edwardsii Stejneger, Report U. S. Nat. Mus. for 



1893, 1895, p. 416, pi. 6; Cope, Report U. S. Nat. Mus. for 1898, 



1900, p. U44, fig. 328; Stejneger, Proc. U. S. Nat. Mus., Vol. 



XXV, 1902, p. 158; DiTMARS, Repti e Book, 1907, p. 438, pi. 



CXXV, figs. 3, 5; Ellis & Henderson, Univ. Co orado Studies, 



Vol. X, No. 2, 1913, p. Ill; Stejneger & Barbour, Check List 



N. Amer. Amph. Rept., 1917, p. 107; Vorhies, Univ. Ariz. Agric. 



Exper. Station Bull. No. 83, 1917, p. 364; Terron, Mem. y Rev. 



Soc. Cient. Antonio Alzate, Vol. 39, 1921, p. 180. 

 Sistrurus edwardsii, Cockerell, Amer. Nat., Vol. XXX, 1896, p. 326. 

 Sistrurus catenatus Boulenger, Cat. Snakes Brit. Mus., Vol. Ill, 1896, 



p. 570 (part). 

 Sistrurus catenatus consors Brown, Proc. Acad Nat. Sci. Phila., 1901, 



p. 99; Bailev, N. Amer. Fauna, No. 25, 1905, pp. 28, 49; Strecker, 



Baylor Bulletin, Vol. XVIII, No. 4, 1915, p. 43. 



Description. — Rather small. Head flat-topped, subellip- 

 tical in outline when seen from above. Rostral moderately 

 large, bounded behind by internasal, anterior nasal and first 

 labial plates. Plates on top of head are a pair of internasals, 

 a pair of prefrontals, a frontal, supraocular of each side and 

 a pair of parietals. Superior labials 1 1 or 12, separated from 

 eye by one or two scales. Scales on body in 23 or 25 rows, 

 strongly keeled except in about two rows on each side. Anal 

 plate entire. Gastrosteges varying in number from 136 to 

 1 53. Urosteges in a single series of from 24 to 3 1 . 



The color above is yellowish brown, with three series 



