82 REPTILES. 



6. Heterodon, Palisot de Beauvais. 



Body short, thick ; tail short ; head short, large, flat ; head 

 and neck very distensible; rostral shield a trihedral pyramid, 

 prominent, acute, recurved, with a sharp ridge above. Subcau- 

 dal plates bifid. Posterior maxillary teeth longer, smooth, and 

 separated from the anterior ones by an interval. America; 

 Madagascar. 



Heterodon, Palisot de Beauvais; Gray, Synopsis, p. ; 

 Fitzinger, Nov. Syst. p. 66 ; Schlegel, Essai, p. 95 ; Holbr. N. 

 Amer. Herpet. iv. p. 37 ; Baird Sf Girard, Catal. p. 51 ; Dum. 

 8f Bibr. vii. p. 764. Oxyrhina, Gray, Brit. Mus. Vipera, sp., 

 Pelias, sp., Scytale, sp.. Coluber, sp., auct. prior. 



1. Heterodon platyrhinos. 



Hog-nose Snake, Catesby, ii. t. 56. Coluber simus, Linn. 

 Syst. Nat. ed. xii. p. 375 ; Lacepede, Quadr. Ovip. Serp. ii. p. 84. 

 Heterodon platyrhinos, Latr. Kept. iv. f. 1-3 ; Daud. Kept. v. 

 pi. 60. f. 28; Wagl. Nat. Syst. p. 171. Coluber heterodon, 

 Merr. Tent. ; Harlan, Med. and Phys. Researches, p. 120. Hete- 

 rodon annulatus, var., Troost, Ann. Lye. New York, iii. p. 188 ; 

 Schleg. Ess. ii. p. 97, var. ; Storer, Reports of Massach. p. 131 ; 

 Holbr. N. Amer. Herpet. iv. 1. 17- H. platyrhinos, H. cognatus, 

 and H. atmodes, Baird Sf Girard, Catal. p. 51, &c. ; Dum. Sf Bibr. 

 vii. p. 766. 



Scales keeled ; behind the rostral an azygos shield, in direct 

 contact with the frontals; orbit surrounded by small shields; 

 upper labials not in contact with the eye. Ground colour dark 

 or light brown, with a dorsal and a lateral series of large light 

 or brown blotches, sometimes confluent into cross bands ; head 

 with a dark band between the eyes. 



a. Adult. North America. Presented by Dr. R. Harlan. 



b. Adult : discoloured. North America. Old Collection. 



c. Nearly half-grown. North America. Presented by Edward 



Doubleday, Esq. 



d. Nearly half-grown. Charleston. From Paris as H. macu- 



latus. 



e. Half-grown. California. 



/. Adult : discoloured. Central America. Presented by Mrs. 



Drummond. 

 g. Adult. Texas. From Mr. Brandt's Collection as H. texianus. 

 h. Half-grown. N. America. Old Collection. 

 i. Young. N. America. Presented by the College of Surgeons. 

 k. Half-grown. North America. From Mr. Cuming's Collection. 



