10. ANCISTEODON. 523 



p. 53, pi. ix. fig. 18 (1842) ; Bum. Sf Bibr. vii. p. 1494 (1854) ; 



Jan, Icon. OH. 46, pi. v. fig. 1 (1874) ; Bocourt, Miss. Sc. Mex., 



Sept. pi. xxvii. fig. 2 (1882). 

 Cenchris contortriz, Oray, Zool. Miscell. p. 50 (1842), and Cat. p. 16 



(1849). - 

 ? Trigonocephalua atrofuscus, Solbr. op. cit. 2nd ed. iii. p. 43, pi. ix. 

 ? Cenchria atrofuscus, Gray, Cat. p. 16. 

 ? Trigonocephalus histrionicus, Dum. S^ Bibr. Mim. Ac. Sc. xxiii. 



1853, p. 534. 

 Agkistrodon contortrii, Baird 8r Gir. Cat. N. Am. JRept. p. 17 



(1853) ; May, Batr. Rept. Ind. p. 123 (1892) ; Stejneger, Rep. 



U.8. Nat. Mus.f. 1893, p. 401, pi. iii.^ (1895). 

 ? Toxicophis atrofuscus, Baird Sf Gir. I. c. p. 150. 

 Ancistrodon contortrix, Baird, Serp. N. Y. p. 13, pi. i. fig. 3 (1854) ; 



Garm. N. Am. Rept. p. 120, pi. viii. fig. 1 (1883) ; Cope, Proc. 



U.S. Nat. Mies. xiv. 1892, p. 683. 

 ? Ancistrodon atrofuscus, Cope, Chech-List N. Am. Rept. p. 34 (1875). 



Snout rounded or truncate, not turned up, flat above, witli sharp 

 canthus. Eostral once and one fourth to once and a half as broad 

 as deep ; a pair of internasals and a pair of prsefrontals ; frontal as 

 long as or a little shorter than its distance from the end of the 

 snout, usually longer than the parietals ; loreal present, usually 

 separating the upper prseocular from the posterior nasal ; two or 

 three postoculars and one to three suboculars, separating the eye 

 from the labials ; 8 (rarely 9) upper labials, second usually forming 

 the anterior border of the loreal pit. Scales strongly keeled, in 23 

 (rarely 25) rows. Ventrals 145-155 ; anal entire ; suboaudals 31- 

 52, anterior single, posterior divided. Yellowish, pinkish, or pale 

 reddish brown above, with dark brown, reddish-brown, or brick-red 

 cross-bars contracting in the middle ; these bars sometimes broken 

 up on the vertebral line and forming alternating triangles ; a dark 

 temporal streak sometimes present ; yellowish or reddish beneath, 

 more or less profusely speckled with grey or brown and with a 

 lateral series of large blackish spots. 



Total length 990 millim. ; tail 110. 



North America, from Massachusetts and Kansas to Northern 

 Florida and Texas. 



a. $ (V. 153 ; 0. 46). Pittsburg, Pennsylvania. Ohristiania Mus. 



b. J (V. 155 ; C. 39). New Harmony, H. Hanauer, Esq. 



Indiana. [P.]. 



c. 2 (V. 152 : C. 39). Kansas. 



d. $ (V. 147 ; C. 45). Arkansas. Smithsonian Institu- 



tion. 



e. S (V. 151 ; C. 43). Louisiana. 



/■. 2 (V. 146; 0. 42). Fort Worth, Texas. H. Hanauer, Esq. 



[P.]. 

 ff. S (V. 145; 0. ?). Texas. 



h-i, k. cJ (V. 151, 153; N. America. Zoological Society. 



C. 49, 47) & 2 



(V. 150 ; C. 46). 



