SNAKES. 8/ 



3, PiTUOPHIS CATENIFER. 



Coluber catenifer, Blainv. Nouv. Ann. Mus. d'Hist. Nat. 1834, 

 iv. pi. 26. f. 2. Pituophis catenifer, Baird df Girard, Catal. p. 69. 



Scales in thirty-one rows ; each posterior frontal divided into 

 two ; no azygos shield before the vertical ; rostral as broad as 

 high, moderately protruding; eight upper labials, two anterior 

 oculars. 



a. Adult : head injured. Monterey. Presented by J. H. Gur- 

 ney, Esq., M.P. 



4. Pituophis bellona. 



Baird Sc Girard, in Stansbury's Explor. Valley of Great Salt 

 Lake, 1852, p. 350; Catal. p. 66. Pituophis affinis. Hallow. 

 Proc. Acad. Nat. Sc. Philad. 1852, p. 181 ; Capt. Sitgreave's Re- 

 port Exped. Zuni, 1853, p. 130. pi. 10. 



Scales in thirty-three to thirty-seven rows ; each posterior 

 frontal divided into two ; a small azygos shield before the ver- 

 tical ; nine upper labials {Baird 8f Girard, eight) ; one anterior, 

 four posterior oculars. 



a. Half grown : injured. Mexico. From Mr. Warwick's Col- 

 lection. 



5. Pituophis mexicanus. 



Dum. 4* Bihr. vii. p. 236. 



Scales in twenty-nine rows j each posterior frontal divided into 

 two ; rostral shield much higher than broad, very protruding ; 

 eight upper labials (" nine," Dum. 8f Bibr.) ; one anterior ocular. 



a. Very large specimen. Mexico. 



3. Coluber, Linn. 



Body and tail rounded above, generally of moderate length ; 

 head moderate, high, rounded, sometimes rather elongate ; ros- 

 tral rounded, moderate ; one loreal, one anterior, two posterior 

 oculars. Scales generally weakly keeled, sometimes smooth. 

 Teeth equal, smooth. Belly generally checkered with black. 

 Europe ; Asia ; North America. 



Coluber, sp., Linn. Mils. Ad. Fried., and Syst. Nat. t. i. ; 

 Gmelin, Syst. Nat. t. i. ; {Merr. Tent.;) Boi€,Isis, 1826; Schleg. 

 Ess. sur la Phys. Serp. Elaphis, Ablabes, sp., Dum. ^ Bibr. vii. 

 pp. 243, 307. Calopeltis, Bonap. Amph. Eur. p. 4/. 



