11. LacHzsts. 581 
** Keels on the dorsal scales extending nearly to the 
extremity. 
Scales in 29-35 rows; ventrals 167- 
188 ; subcaudals 31-51............ 7. alternatus, p. 541. 
Scales in 21-27 rows; ventrals 168- 
182; subcaudals 41-53............ 8. neuwiedit, p. 542. 
Scales in 23-25 rows; ventrals 149-— 
160; subcaudals 30-38............ 9. ammodytoides, p. 543. 
b. Upper head-scales all smooth ; dorsal scales not strongly 
keeled ; scales in 27 rows; ventrals 196; subcaudals 
ET aeacg so child Pak ps 10. xanthogrammus, 
[p. 543. 
B. Subcaudals all or greater part single. 
1. Second upper labial forming the anterior border of the loreal 
pit; scales in 25-27 rows; ventrals 230-253 ; subcaudals 
F2=Saa ee 8 AP EU 11. castelnaudi, p. 544. 
2. Loreal pit separated from the labials. 
a. Supraocular narrow, separated from its fellow by 7-10 
series of scales; scales in 23-27 rows; ventrals 121- 
134; subcaudals 26-36 .... 12. nummifer, p. 544. 
b. Supraocular large, separated from its fellow by 5-7 series 
of scales. 
Snout not turned up; rostral not deeper 
than broad; scales in 21 rows; ven- 
trals 135-142; subcaudals 22-34 .. 13. godmani, p. 545. 
Snout turned up at the end ; rostral once 
and one third to once and a half as 
long as broad ; scales in 25-27 rows; 
ventrals 152-159 ; subcaudals 29--35. 14. lansbergiz, p. 546. 
Snout much produced above at the end; 
rostral once and two thirds to twice as 
deep as broad; scales in 23-25 rows; 
ventrals 132-150; subcaudals 27-38 . 15. brachystoma, p. 547. 
II. Asiatic species; subcaudals in two rows. 
A. Scales between the eyes smooth or obtusely keeled; gular 
scales smooth ; first lower labial in contact with its fellow 
behind the symphysial. 
1. Scales in 21-25 (rarely 27) rows; ventrals 129-158; sub- 
caudals 21-57 ; 5 to 9 series of scales between the supra- 
oculars ; tail not prehensile. 
Supraoculars large, separated by 5 to 8 
series of scales; scales smooth or 
feebly keeled; canthus  rostralis 
Onassis Te ira te take 16. monticola, p. 548, 
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