148, pIpPsADOMORPHUS. 61 
Preocular usually in contact with or 
narrowly separated from the frontal; 
subcaudals 90-125 ......... .. 5. ceylonensis, p. 66. 
Preocular not reaching the frontal ; 
subcaudals 87-103 ............ 6. fuscus, p. 67. 
b. Posterior chin-shields not larger than the anterior. 
a. Scales in 19 rows; ventrals 240-260; subcaudals 
BA0-124 het eens 7. pulverulentus, p. 68. 
B. Scales in 21 or 23 rows. 
* Subcaudals 89-110. 
Scales in 21 rows, vertebrals feebly 
enlarged ; ventrals 231-248...... 8. multifasciatus, p. 69. 
Scales in 23 rows, vertebrals feebly 
enlarged; ventrals 241.......... 9. dightonii, p. 69. 
Scales in 21 (rarely 23) rows, verte- 
brals more or less strongly enlarged ; 
ventrals 209-239 ...........56% 10. dendrophilus, p. 70. 
** Subcaudals 124-144; scales in 21 rows. 
Ventrals 237-252; subcaudals 124- 
MM ear ous. dicig sho atin sais ga ahs 11. cyaneus, p. 72. 
Ventrals 240-263 ; subcaudals 143- 
DONT sty. 5 aves bee 4 mints oid NS 12. nigriceps, p. 72. 
B. Snout as long as the eye. 
1. Scales in 21 rows ; ventrals 243-266 ; subcandats 14 166. : 
wer ers p. 73. 
2. Scales in 19 r 
Ventrals 220; s yeaudals 99; three 
PRROOCUALG. «fh vias cb doe xcs acde'g 3s 14, barnesii, p. 73. 
Ventrals 250-276; subcaudals 114—- 
163; posterior chin-shields not 
much smajler than the anterior .. 15, drapiezi, p. 74. 
Ventrals 254-258 ; subcaudals 126- 
135; anterior chin-shields nearly 
thrice ag large as the posterior .... 16. angulatus, p. 75. 
II. Antefior palatine teeth strongly enlarged. 
A. Ppsterior chin-shields larger than the anterior; scales i in 19- 
‘to 23 rarely 25) rows. - 
Scales in 19-23 rows; ventrals 217- 
270; anal entire; subcaudals 103- 
5; one preocular, extending to 
:pper surface of head .......... 17. irregularis, p. 75. 
