57. DRYMOBIUS. 9 



p. 203 (1854) ; Giinth. Cat. Col Sn. p. 113 (1868) ; Jan, Elenco 



tut. Ofid. p. 80 (1863); 

 Coryphodon (non Owen), part., Dum. fy Bibr. t. c. p. 180 ; Giinth. 



l.'c. p. 107 ; Jan, I. c. p. 63. 

 Leptopnis, part., Dum. $ Bibr. t. c. p. 628. 

 Dromicus, part., Dum, 8f Bibr. t. c. p. 646 ; Giinth. I. c. p. 126. 

 Drymobius, part., Cope, Proc. Ac. Philad. 1860, p. 560; Bocourt, 



Mitt. Sc. Mtx., Kept, p. 715 (1890). 

 Dendrophidium, Cope, 1. c. p. 561 ; Bocourt, I. c. p. 730. 

 Ablabes, part., Jan, I. c. p. 51. 

 Thamnosophis, part., Jan, I. c. p. 82. 

 Tropidonotus, part., Jan, I. c. p. 68. 

 Euoryas, Bocourt, I. c. p. 716. 

 Crossanthera, Cope, Am. Nat. 1893, p. 481. 



Maxillary teeth 22 to 38, increasing in size posteriorly, the two 

 or three last stouter if not longer than those preceding them ; 

 mandibular teeth subequal or anterior somewhat enlarged. Head 

 elongate, distinct from neck ; eye large, with round pupil ; no sub- 

 oculars. Body elongate, cylindrical ; scales smooth or keeled, with 

 apical pits, in 15 or 17 rows ; ventrals rounded or with an obtuse 

 lateral keel. Tail long ; subcaudals in two rows. 



America, from Texas to Peru and Southern Brazil. 



This genus is very closely allied to, and intermediate between, 

 both Zamenis and Coluber. It is just separable from the former by 

 the greater number of teeth ; and it is connected with the latter 

 by D. bifossatus and D. boddaertii, the dentition of some specimens 

 of which approaches the isodont type. The subocular shield below 

 the praeocular, present in most of the species referred to Zamenis, is 

 constantly absent in Drymobius. 



Fig. 2. 



Maxillary and mandible of Drymobius bijossatus. 



Synopsis of the Species. 



I. Scales smooth. 



Scales in 15 rows; tw^ labials entering 



the eye N 1. bifossatus, p. 10. 



Scales in 17 rows; usually three labials 



entering the eye 2. boddaertii, p. 11. 



I 1 . Scales keeled. 



A. Scales in 15 rows 3. affinis, p. 14. 



