154 



COLTJBBID^. 



pupil. Body stout, subojdindrical ; scales keeled, witli apical pits, 

 in 23 to 27 rows ; ventrals rounded. Tail short ; suboaudals in 

 two rows. 



North America. 



Fig. 14. 



Maxillary and mandible of Heterodon platyrhinus. 



Synopsis of the Species. 



Maxillary teeth 9 to 11 + 2; praefrontals 



usually in contact with each other ; 



frontal longer than broad ; rostral 



narrower than the distance between 



the eyes 1. platyrhinus, p. 154. 



MaxiUary teeth 8 or 9 + 2 ; internasals and 



praefrontals separated by small irre- 

 gular shields ; frontal as broad as 



long or slightly longer ; rostral 



narrower than the distance between 



the eyes 2. simus, p. 156. 



Maxillary teeth 6 to 8 + 2 ; internasals and 



praefrontals separated by small irre- 

 gular shields ; frontal as broad as long 



or broader; rostral as broad as the 



distance between the eyes 3. nasieus, p. 156. 



1. Heterodon platyrhinus. 



Cateshy, Nat. Sist. Carol, ii. pis. xliv., Ivi. (1743). 



? Coluber leberis, Linn. S. N. i. p. 375 (1766). 



Heterodon platyrhinus, Latr. Sept. iv. p. 32 (1800) ; Storer, Hep. 

 Fish. ^ Sept. Mass. p. 231 (1839) ; Holbr. N. Am. Sept. iv. p. 67, 

 pi. xvii. (1842) ; Dekay, Faun. N. York, Sept. p. 51, pi. xiii. fig. 28 

 (1842) ; Baird ^ Gir. Cat. N. Am. Sept. p. 51 (1853) ; Giinth. 

 Cat. p. 82 (1858) ; Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 220, 

 and Icon. Gen. 48, pi. iii. %. 2 (1876) ; Garm. N. Am. Sept. p. 75, 

 pi. Ti. fig. 5 (1883) ; Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 643 ; 

 H. Garm. Bull. Illin. Lab. iii. 1892, p. 302; Hay, Batr. iSf Sept. 

 Indiana, p. 102 (1893). 



Coluber cacodeemon, Shaio, Zool. iii. p. 377, pi. cii. (1802). 



Scytale nigsr, Daud. Sept. v. p. 342 (1803). 



Coluber heterodon, part.. Baud. Sept. vii. p. 153 (1803) ; Say, Amer. 

 Journ. i. 1818, p. 261. 



