154 COLUBRID^, 



pupil. Body stout, subcylindrical ; scales keeled, with apical pits, 

 in 23 to 27 rows ; veutrals rounded. Tail short ; subcaudals in 

 two rows. 



North America. 



riff. 14. 



Maxillary and mandible of Hcterodon platyrhinus. 



Synopsis of the Species. 



Maxillary teeth 9 to 11 + 2; prrefrontals 



usiially in contact with each other ; 



frontal longer than broad ; rostral 



narrower than the distance between 



the eyes 1. plaiyrJiinus, 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 



priiefrontals separated by small irre- 

 gular shields ; frontal as broad as long 



or broader ; rostral as broad as the 



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



1 . Heterodon platyrhinus. 



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



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



Heterodon platyrhinus, Latr. Rept. iv. p. 32 (1800) ; Storer, Rep. 

 Fish. Sf Rept. Mass. p. 231 (1839) ; Holbr. N. Am. Rept. iv. p. 07, 

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

 (1842) ; Rnird S,- Gir.' Cat. N. Am. Rept. p. 51 (1853) ; Giinth. 

 Cat. p. 82 (1858) ; Ja7i, Arch. Zool. Anat. Phys. ii. 1863, p. 220, 

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

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

 H. Garm. Bnll. Illin. Lab. iii. 1892, p. 302; Hay, Batr. Hf Rept. 

 Jwrfiawa, p. 102(1893). 



Coluber cacodsemon, Sham, Zool. iii. p. 377, pi. cii. (1802). 



Scytale nigpr. Baud. Rept. v. p. 342 (1803). 



Coluber heterodon, part., Daud. Rept. vii. p. 153 (1803) ; Say, Amer. 

 Journ. i. 1818, p. 261. 



