ioe «te 2 Sere Oe ee ee ee ee 
5 ; 
pw 
196 COLUBRID. 
Only the outer row of scales smooth ; ven- 
trals 130-146; subcaudals 64-92 .... 33. asperrimus, p. 232. 
Only the outer row of scales smooth; usu- 
ally a single labial entering the eye; 
ventrals 145-161; subcaudals 54-69 .. 34. annularis, p. 233. 
3. Scales in 19 to 23 rows, strongly keeled; a single anterior 
temporal; one or two labials entering the eye. 
a. Head distinct from neck. 
a. Ventrals 160-197; scales in 19 rows; 4th, or 4th 
and 5th labials entering the eye. 
35. tessellatus, p. 233. 
B. Ventrals 147-160; scales in 21 or 23 rows; 3rd 
and 4th labials entering the eye. 
36. viperinus, p. 235. 
y- Ventrals 126-147 ; scales in 19 or 21 rows; 4th and 
5th labials entering the eye. 
Frontal twice as long as broad; scales 
usually in 19 rows, outer row faintly 
RORIOE Sc ciety aia cleats os Ob Sins -... 37, validus, p. 237. 
Frontal once and two thirds to twice as : 
long as broad ; scales in 21 rows, outer 
row distinctly keeled................ 38. clarkii, p. 238. 
Frontal broad; tail compressed at the [p. 238. 
ES EER EE Cee Se ne pre RE opal 39. compressicauda, 
b. Head small, not or but scarcely distinct from neck; scales 
in 19 or 21 rows; third and fourth labials entering the 
eye. 
Frontal hardly once and a half as long as 
broad; ventrals 140-151; subcaudals [p. 239. 
C4-B0 Sy eitew teh bi vias net sen) 2 pee ee 40, septemvittatus, 
) Frontal twice as long as broad; ventrals 
132-142; subcaudals 51-71..:........ 41. rigidus, p. 240. 
Frontal once and two thirds to twice as 
long as broad; ventrals 156-173; sub- 
caudals 47-65 ...... cc cececeeces .. 42. grahami, p. 240. 
: 4. Scales in 21 to 27 rows; not more than one labial entering 
. the eye. 
, 
Eye separated from the labials by subocu- 
lars ; frontal once and one third to once 
and a half as long as broad .. ........ 43, ferox, p. 241. 
Eye separated from the labials by subocu- 
lars ; frontal elongate ...........46: 44, anoscopus, p. 242. 
Fourth labial entering the eye.........- -45, fasciatus, p, 242. 
