28 COLUBRID®. 
** Scales in 21 or 23 rows. [ 
Third and fourth labials entering the eye.. 24. conspicillatus, 
Fourth and fifth labials entering the eye.. 25. lonyissimus, p. 52. 
p. ol. 
$B. A subocular below the przocular. 
* Seales in 23 or 25 rows. 
Scales feebly keeled; ventrals 226-244 ; [p. 54. 
subcaudals 97-122.................. 26. climacophorus, 
Scales strongly keeled; ventrals 209-220 ; 
pubesadals 60-06... ...csciatig. ps ext om 27. phyllophis, p. 55. 
Scales strongly keeled ; ventrals 173 ; sub-. 
AMG AIS SO). ob. erm is occ RmSkewRe Ss heuer vReS 28. davidi, p. 56. 
** Scales in 27 rows; ventrals 268-274; subcaudals 
97-99 ............2.... 29. moellendorfir, p.56. 
b. Subcaudals 122-149; scales smooth or faintly keeled, in 
23 to 27 rows; ventrals 236-263. 
Two labials entering the eye; green above. 30. oxycephalus, p. 56 
Three labials entering the eye; tail black.. 31. jansent, p. 57. 
2. Anal usually divided; scales in 17 or 19 rows; ventrals 
193-210. 
a. Scales in 19 rows. 
a. Three labials entering the eye. 
No loreal; subcaudals 120-121 ........ 32. frenatus, p. 58. 
A loreal; subcaudals 91-107 .......... 33. prasinus, p. 59. 
3. Two labials entering the eye ; subcaudals 70-96. 
3. Anal entire ;. scales keeled. 34. quadrivirgatus,p.59. 
a. Scales in 19 rows, 21 on the neck. 
All caudal scales keeled................ 35. melanurus, p. 60. 
Outer caudal scales smooth ............ 36. radiatus, p. 61. 
b. Scales in 21 rows, 23 on the neck. 37. erythrurus, p. 62, 
c. Scales in 23 or 25 rows, 25 or 27 on the neck. 
Rostral a little broader than deep; three 
labials entering the eye.............. 38. enganensis, p. 63. 
Rostral much broader than deep; two la- 
bials entering the eye .............. 39. subradiatus, p. 64. 
II. The portion of the rostral shield visible from above measuring 
at least half its distance from the rostral. 
A. Scales smooth. 
Rostral deeper than broad; anal usually 
AIVIGOd, ©... cs » «kine eRe rate 41. scalaris, p. 65. 
Rostral as deep as broad; anal entire .... 42. arizona, p. 66. 
