332 COLUBRID. 
TT Diameter of the eye not more than its distance 
from the mouth. 
Rostral as deep as broad ; first and second 
labials subequal in size ............ 14. virgulata, p. 340. 
Rostral nearly as deep as broad ; second 
labial larger than first ............ 15. leucogaster, p. 341. 
Rostral much broader than deep; anal 
BIVIGCR: acti. US Os Den eee eee 16. occipitalis, p. 342. 
** Frontal more than twice as broad as the supra- 
OCGA AGE oe vader 17. bicolor, p. 342. . 
(3. A preocular ; postocular fused with the supraocular. 
18. lateralis, p. 342. 
y. A preocular ; two postoculars. 
19. beccarvi, p. 343. 
6. No preocular.......... 20, rebentischii, p. 343. 
2. Frontal as broad as long ; rostral broader than deep. 
a. First lower labial in contact with its fellow behind the 
symphysial, 
MMEPOOUIAT 25. 5285 bay als ioral es 21. agamensis, p. 343. 
REMC MGT cence Ce aahc he ets ies 22. leucocephala, p. 344. 
6. Symphysial in contact with the chin-shields ; no preocular. 
23. schlegelu, p. 345. 
B. Four upper labials, second and third entering the eye. 
1, Frontal longer than broad. 
a, Symphysial in contact with the chin-shields. 
a. A preocular. 
Tail obtuse; the portion of the rostral 
visible from above shorter than its 
distance from the frontal .......... 24. ennai, p. 345. 
Tail obtuse ; the portion of the rostral 
visible from above at least as long as 
its distance from the frontal........ 25. borneensis, p. 347. * 
Tail ending in a sharp point.......... 26. benjaminsii, p. 347. 
(3, NomimmorHler. -..cj..c 0% aie. = 27. javanica, p. 347. 
b. First lower labial in contact with its fellow behind the 
symphysial. 
Frontal as long as the parietals, not twice 
as broad as the supraocular ........ 28. brevis, p. 348. 
Frontal shorter than the parietals, at 
least twice as broad as the supraocular. 29. pavimentata, p. 348. 
2. Frontal as broad as long. 
First lower labial in contact with its 
fellow behind the symphysial ; tail 
rounded at the end .............. 30. septentrionalis, p. 349. 
