b, Six upper labials. 
Rostral broader than deep ; posterior 
chin-shields separated by scales 
Rostral broader than deep; posterior 
chin-shields in contact with each 
EU RR cP ei DOE Madde es ene 
Rostral as deep as broad; posterior 
chin-shields in contact with each 
Co er ia eae Sg whe hue 
14, coronatus, p. 279. 
272 COLUBRID. my is 
x 
Frontal shorter than its distance from a 4 
the rostral ; 48-50 scales round the - 
GUA pumas hip eis <inies @o0'0 0 6. ceerulescens, p. 275. —- 
Frontal as long as its distance from - | 
the end of the snout; 42 scales 
RUNG UG DONG 5 hi veces hos 9 7. frontalis, p. 276. 
2, 25-29 scales round the neck, 35-39 round the body. 
a. Seales all imbricate; posterior chin-shields separated by 
scales. 
Rostral as deep as broad .........- 8. kingii, p. 276. 
_Rostral broader than deep......... . 9. nigrocinctus, p. 277. 
b. Scales on the body juxtaposed ; posterior chin-shields in 
contact with each other.. 10. mamillaris, p. 277. 
B. A single anterior temporal, : 
1. 27-31 scales round the neck, 40-48 round the body; ) 
ventrals 345-500. 7 
Rostral broader than deep; frontal a q 
little longer than broad; scales - | 
imbricate ; seven upper labials.... 11. elegans, p. 278. ~ 
Rostral deeper than broad; frontal i 7 
longer than broad ; scales on body 
WERTAOSO |." L's. ao sk vy a eee. 16, cantoris, p. 281. 
Rostral nearly as deep as broad; F 
frontal much longer than broad .. 17. fasciatus, p. 281. : 
Rostral a little broader than deep; r 
frontal slightly longer than broad; . gs 
scales imbricate; six upper labials. 18. brookii, p. 282. 4 4 
2. 19-23 scales round the neck, 29-33 round the body q 
ventrals 225-337. 
a. Seven or eight upper labials; rostral as deep as broad ; = 3 
frontal twice as long as broad. | @: 
12. pacificus, p. 278. $ 
13. latifasciatus, p. 279. 
15. gracilis, p. 280. 
3. 25 scales round the neck, 35 round the body ; ventrals 329. 
19. melanocephalus, p. 283. 
4, 33-40 scales round the neck, 40-50 round the body. 
Frontal shorter than its distance from 
the rostral; ventrals 240-285 .... 
20. torquatus, p. 283. 
