t»OiSONOUS SNAKES OF NORTH AMERICA. 



411 



b-. Nuiiroer of scale rows usually 23 S. e. Edwardsii 



K Prefrontals in coutact with the loreal proper; a whitish stripe from below center 

 of eye to angle of mouth (Hg. 46) S. miliarius 



Fig. 45. 

 HEAD OF SISTRURUS CATENATUS. 

 From side, sliowing color p;itterii. 



Fig. 46. 



HEAD OF SISTRURUf* MILIARIUS. 



From sidf, showing color pattern 



A pretty good cliaiacter in dubious cases between IS. catenatus typi- 

 i'iil and *S', mUlanus consists in the pattern of the parietals. if visible. 



Fig. 47. 



COLOR PATTEEN OF TOP OF HEAD OF SISTRURUS 

 CATKNATUS. 



Fig 48 



COLOR PATTERN OF TOP OF HEATi OK SISTBUEUS 



MILIAEIUS. 



In the former there is a dark patch covering the center of the parietal 

 suture (tig. 47), while in the latter the light portion forms a narrow 

 band down the entire length of this suture (tig. 48). 



The Massasauga. 



Siatrurus cutenatus,* (Ratiuesque). 



Plate 5. 



\S\%.—Crotalir\ns cato/a/«s, Rafinesque, Aiuer. Monthl. Mag., iv, 1818, p. 41. — 

 Crotalns catetiatus, GwiMAN, N. Am. Rept., i, Opbid., p. 118 (1883). — Sis- 

 trtiruisailenaUis, Garman, N. Am. Rept. i, Ophid., p. 176 (1883).— Jordan, 

 Man. Vert. North. U. S., 5ed., p. 199 (1888). — Taylor, Ann. Rep. Nebraska 

 State Board Agric, 1891, p. 355 (1892).— Osborne, Part. Cat. Anim, Iowa, 

 p. 9 (1892).— H. Garmax, Bull. 111. State Lab. Nat. Hist., iii, p. 312 

 (1892),— H. Garman, Bull. Essex Inst., xxvi, 1894, ]>. 62.— Hay, Batr. 

 Rept. Indiana, p. 126 (1893). — Huhter, Trans. Acad. Sc. 8t. Louis, vi, p. 

 2.58(1893). — Crotalophorus catciiains. Cope, Proc. U. 8. Nat. Mus.,xiv, 1891, 

 p. 685 (1892).— Hay, Proc. U. S. Nat. Mus., xv, 1892, i). 387. 



1823. — Crot(thi8tergemiiius, Say, in Long's Exped. Rocky Mts., I, p. 499. — Harlan, 

 .Journ. Phila. Acad.,v, 1827, (p, 372).— Harlan, Phys. Med. Res., p. 135, 

 (1835),— DUMERIL ET BiBKON, I^rjx't. Goner., vii, ii, p, 1479 (18.51 ) —Cope, 

 lu Mitchell's Res. ^'en. Rattlesn., p. 125 (1861).— Hayui .\. fnins. Am. 



* From the Latin catenatus, chained, chaiu-like. 



