A NEW PIT VIPER OF THE GENUS ANCISTEODON. 793 



From this it will be seen that 43 examples from Ceylon have 

 a range of ventrals from 116 to 131, and subcaudals 24 to 37. In 18 

 others from Ceylon and India (Western Ghats) the range of ventrals 

 is 136 to 152, and subcaudals 30 to 44. 



The former species which I take to be " forma typica " has the pro- 

 nounced nasal appendage, and fewer ventrals, and subcaudals. The 

 latter form appears to me equally deserving of a specific title, and I 

 propose to call it millardi in recognition of the great impetus given 

 to Natural History researches in India by Mr. W. S. Millard by 

 years of indefatigable labour in the interests of our Society. 



Description. — Snout with slightly developed prominence above, 

 covered with from 4 to 6 scales subequal to those seen elsewhere 

 on the snout. Frontal. Less than distance to end of snout, about 

 two-thirds the breadth of the supraoculars on a line connecting the 

 centres of the eyes. Supraoculars. As long as the parietals. Nasal. 

 An entire shield in contact with the 1st but not the 2nd labial. Loreal. 

 A single shield behind the nasal grooved to form the inner wall of the 

 loreal pit, and quite distinct from the 2nd supralabial.* Prceoculars. 3, 

 the lower two diverging to border the loreal pit. Postoadar. One. 

 Subocular. Usually one long arc-shaped shield, sometimes subdivided. 

 Temporals. One enlarged row. Supralabials 7, none touching the 

 eye. Infralabials 3. Sublinguals. A single pair. 



* In this it agrees with hypnale though Boulenger (Cat. Vol. Ill, p. 528) says that the 

 L'nd supralabial enters the loreal pit in that species. 



