11. LAcHEsIS. 533 
Scales strongly keeled, in 13-15 rows; 
ventrals 134-143; subcaudals 48-56. 30. macrolepis, p. 560. 
B. Scales between the eyes smooth; gular scales smooth; first 
lower labial divided, the separate portion forming a pair of 
small additional chin-shields; scales feebly and obtusely 
keeled ; ventrals 144-176; subcaudals 38-57; tail pre- 
hensile. 
Scales in 21-23 rows; second upper 
labial usually not bordering the loreal 
pit; 12-14 series of scales between 
the supraoculars ..............6- 31. puniceus, p. 560. 
Scales in 19-21 rows; second upper 
labial bordering the loreal pit; 10-11 
series of scales between the supra- 
OORIATS.”. . FEIN ae endo 6 eae oles 32. borneensis, p. 561. 
C. Upper head-scales all strongly keeled; gular scales keeled ; 
scales more or less distinctly keeled, in 19-27 rows ; ventrals 
127-154; subcaudals 45-55 ; tail prehensile. 
33. waglert, p. 562. 
III. American species, with prehensile tail. 
A. Subcaudals all or greater part in two rows. 
Scales in 27-35 rows; ventrals 198— 
218; subcaudals 59-71 .......... 34. bilineatus, p. 565. 
Scales in 21 rows; ventrals 149-171; 
subcaudals 41-49; a horn-like scute 
above the eyes ii. eas wea MG ate 35. undulatus, p. 565. 
B. Subcaudals all or greater part single. 
1. Supraocular shield narrow ; scales in 21-23 rows; ventrals 
164-171; subcaudals 59-67. 
Loreal pit separated from the labials; 
tigher labile... 2... oes ee 36. lateralis, p. 566. 
Second labial forming the anterior border 
of the loreal pit; 10 or 11 upper 
SOWA ential is shoals oss « eS 37. bicolor, p. 566. 
2. Supraocular shield large, separated from the eye by a series 
of pointed scales; scales in 19-25 rows; ventrals 138- 
162; subcaudals 47-62 .... 38. schlegelii, p. 567. 
3. Supraocular shield large, bordering the eye; scales in 19 
rows. 
5 or 6 series of small scales between the 
supraoculars ; ventrals 134-146; sub- 
caudals 49-54 1.1... . eee ee eee 39. nigroviridis, p. 568. 
An enlarged frontal shield; ventrals 
154-158 ; subcaudals 53-61........ 40. aurifer, p. 568. 
