57. DRYMOBIUS. 9 
p. 203 (1854); Giinth. Cat. Col. Sn. p. 118 (1858) ; Jan, Elenco 
sist. Ofid. p. 80 (1863). 
Coryphodon (non Owen), bg Dum. & Bibr. t. c. p. 180; Giinth. 
lc. p. 107; Jan, l. c. 
Leptophis, part., Dum. PB Bibr. t.c. p. 528, 
Dromicus, part., Dum. § Bibr. t. c. p. 646 ; Giinth. 1. c. p. 126. 
Drymobius, part., Cope, Proc, Ac, Philad. 1860, p. 560; Bocourt, 
Miss. Se. Mex., Rept. p. 715 (1890). 
Dendrophidium, Cope, L, ¢. Ie 561; Bocourt, l. c. p. 730. 
Ablabes, part., Jan, l. c. p. 51. 
Thamnosophis, part., Jan, lc. p. 82. 
Tropidonotus, part., ‘Tan, I. ce. p. 68. 
Eudryas, Bocourt, le Ch Ps (1G: 
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 Zaments 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. boddaertiui, the dentition of some specimens 
of which approaches the isodont type. The subocular shield below 
the preocular, present in most of the species referred to Zamenis, is 
constantly absent in Drymobuus. 
Maxillary and mandible of Drymobius bifossatus. 
Synopsis of the Species. 
I. Scales smooth. 
Scales in 15 rows; two labials entering 
ROR MELAS FTN Segoe ad nts. 1. bifossatus, p. 10. 
Scales in 17 rows; usually three labials 
enterilig theleyet i. i.e ee 2. boddaerti, p. 11. 
II. Scales keeled. 
A. Scales in 15 rows.......... ... 3. affinis, p. 14: 
