79. HETERODOX. 



155 



Coluber heterodon, Harlan, Phyg. Med. Ret. p. 130 



thra.-o, Har 1. I. c. 



I li-ttT.'doi) niiriT. Troost, Ann. Li/r. X. }'//, iii. 1836, p. 186; 



Ilolhr. I. c. p. 03, pi. xvi. ; BaMQ Gir. Cut. p. 06; Dum. Of Btir. 



vii. p. 7(i!>; (ninth, ('.it. p. 83. 



annulatus, Troost, 1. c. p. 188. 



tigrinus, Troost, 1. c. p. 189. 



cognatus, Baird 8f Gir. 1. c. p. 54 ; Garm. Bull. Etstx Intt. 



xxiv. 189_>, p. 106. 

 atmodes, Baird Sf Gir. I. c. p. 57. 



Maxillary teeth 9 to 11 + 2. Rostral considerably narrower than 

 the distance between the eyes ; an azygous shield separating the 

 internasals ; pnefrontals usually in contact with each other ; frontal 

 longer than broad, shorter than its distance from the end of the 

 snout, as long as the parietals ; loreal deeper than long ; eve 

 surrounded by 10 or 11 shields in addition to the supraocular ; 

 temporals small, scale-like ; seven or eight upper labials ; one pair 

 of chin-shields, in contact with three lower labials. Scales strongly 

 keeled, of outer row smooth, in 23 to 27 rows. Ventrals 10-150 ; 

 anal divided ; subcaudals 37-60. 



Total length 800 millim. ; tail 130. 



United States, east of the Rocky Mountains. 



A. Brown or red above, with a dorsal series of large square or 

 transverse dark brown or black spots, separated from each 

 other by light interspaces, and a lateral alternating series of 

 smaller spots ; an elongate black blotch or band on each side 

 of the head, sometimes extending forwards to the frontal, a 

 transverse dark band between the eyes, and an oblique one 

 from the eye to the angle of the mouth ; belly yellowish or 

 reddish, clouded with brown. 



a, b. rf (Sc. 25; V. 127; 

 C. 50) & yg. (Sc. 25 ; 

 V. 128; C. 63). 



c. <$ (Sc. 25; V. 127; 

 C. 52). 



d. Yp. (Sc. 23; V. 120; 

 C. 52). 



e. Yg. (Sc. 25; V. 128; 

 C. 49). 



Bloom ington, 

 Indiana. 



Pennsylvania. 

 Charleston. 

 S. Carolina. 



C. H. Bollman, Esq. 



[C.]. 



Smithsonian In-tit. 

 [P.]. 



/-A, i. rf (Sc. 25; V.I 29, 



l-"0; C. 48,48), $ (Sc. 



-': V. l:;j : C. 37), & 



yg. (Sc. 25; V. 128; 



C. 48). 

 *. $ (Sc. 25; V. 141; Texas. 



C. 44). 



/. Sk'-leton. V \merica. 



m. Skull. N. America. 



Smithsonian In-lit. 

 [P.]. (As typical of 

 II. atmodes.) 

 Duval Co., Texas. \V. Taylor, Esq. [C.]. 



