SNAKES. 135 



Synopsis of the Genera. 



1. PsAMMOPHis. Body and head elongate. Scales flat. Africa; 



Central America. (India?) 



2. CcELOPELTis. Scales grooved. N.Africa; S.Europe. 



3. EuGPHRYS. Body and head moderate. Scales flat. China. 



4. PsAMMODYNASTES. Body stout ; head short. East Indies. 



1. PsAMMOPHis, Boie. 



Body and tail elongate ; head with flat, on the sides rounded 

 crown; loreal region grooved; snout pointed in front, rather 

 elongate ; posterior frontals behind produced in an obtuse angle ; 

 vertical shield long, narrow' ; one elongate loreal, two nasals, 

 one anterior and two posterior oculars. Scales elongate, smooth, 

 in fifteen to nineteen rows ; pu})il round. Posterior maxillary 

 tooth channeled, long; fourth or fifth maxillary tooth longer 

 than the other ones (in one species equal) ; anterior teeth of the 

 lower jaw longer than the hinder ones. Africa ; Central America. 

 (India?) 



Psammophis, Dum. 4* Bibr. vii. p. 88/ ; Wagl. Syst. Amph. 

 p. 189. Tomodon, sp., Dum. Sf Bibr. vii. p. 936. Psammophis, 

 sp., Boie, Isis, 1827, p. 547 ; Schleg. Ess. ii. p. 201. Macrosoma, 

 {Leach, Boivdich, Ashantee, App. 41)3, 1819) Gray, Ann. Phil. 

 1825. Coluber, sp., auct. prior. 



1. Psammophis lineatus. 



Tomodon lineatus, Dum. Sf' Bibr. vii. p. 936. pi. 73. 



Olive, with a dark, black-edged dorsal band from the snout to 

 the end of tail, posteriorly sometimes only the narrow black edges 

 visible ; on each side a black line from the nostril through the 

 eye to the end of tail. 



a. Adult. Mexico. 



In this species all the teeth before the grooved one are equal 

 in length. 



2. Psammophis crucifer. 



Seba, ii. 53. 2, and 107.4. Coluber lurus, Klein, Tent. p. 36. 

 Coluber crucifer (Kreutznatter), Merr. Beitr. i. pi. 3, and Tent. 

 p. 106; Daud. Kept. vii. p. 189. Psammophis crucifer, Boie, 

 Isis, 1827, p. 547 ; Dum. ^- Bibr. vii. p. 892. Psammophis 

 moniliger, var., Schleg. Ess. ii. p. 209. pi. 8. f. 6, 7- 



Closely allied to former, but smaller; crown with a medial 



