256 COLUBRID. 
a. Seven upper labials; portion of rostral visible from above 
not more than half as long as its distance from the 
~ frontal. 
a. Ventrals 103-148. 
Seales in 15 rows; subcaudals 65-94 .... 2. vernalis, p. 258. Liepeltey 
Scales in 13 rows; subcaudals 51-64 .... 3. agassizi, p. 259. 
Seales in 15 to 19 rows ; subcaudals 24-52. 11, coronella, p. 264. 
6. Ventrals 150-235; subcaudals 48-85; scales in 15 or 
17 rows. 
* Rostral as deep as broad or a little broader than 
deep; scales in 15 or 17 rows; ventrals 150-191. 
Frontal at least twice as long as broad .. 4. decemlineata, p. 260 
Frontal not twice as long as broad ...... 5. collaris, p. 260. 
** Rostral considerably broader than deep; scales in 
15 rows. 
+ Frontal as long as the parietals ; ventrals 158-171. 
6. fasciata, p. 262. 
++ Frontal much shorter than the parietals. 
Frontal once and two thirds as long as 
road.> wventrais L8G"... ao. 5 rikcn ues ee 7. angusticeps, p. 262. 
Frontal not once and a half as long as 
broad; ventrals 159-187 ......... . 8. rothi, p. 262. 
Frontal once and a half as long as broad, 
about once and a half as broad as the 
supraocular; ventrals 194-216 ...... 9 persica, p. 263. 
Frontal once and a half as long as broad, 
nearly twice as broad as the supraocular; 
Re thas 2 IDG iy cr 2 is esate Semin as ne 10. walteri, p. 263. 
b. Seven upper labials ; portion of rostral visible from above 
measuring one half to two thirds its distance trom the 
frontal. 
a. Scales in 13 rows; ventrals 126-137 ; subcaudals 
EAD os Fs hencap oem oo 3) 0 12. taylori, p. 265. 
3. Scales in 15 rows. 
* Body without black cross bars, 
Wanttals 145—UGremie ca eels 6 isla es 6 ose 13. episcopa, p. 265. 
Ventrals 168. cmcemas secs ese arlae sees 14. torquata, p. 266. 
** Body with black cross bars, 
Ventrals 158-167; subcaudals 50-52.... 15. tsozona, p. 266. 
Ventrals 147-158; subcaudals ?4-44..... 16, occipitalis, p. 266. 
