532 VIPERID. 
Supraoculars large, separated by 6 to 9 
series of scales ; scales strongly keeled ; 
canthus rostralis sharp and raised.... 17. okinavensis, p. 549. 
Supraoculars small, sometimes broken 
up, separated by 8 to 11 series of jux- 
taposed, convex scales; scales feebly 
Wbeled oc ou cobs cn eass bob 6s cbeAe 18. strigatus, p. 549, 
2. Scales in 27-37 rows, feebly keeled ; ventrals 174-231 ; 
subcaudals 54-90; tail not prehensile. 
Scales in 33-37 rows; ventrals 222- 
231; subcaudals 75-90 ; 8 or 9 upper 
Ipbiale 2c... cc seis clan eens peas 19. flavoviridis, p. 550. 
Scales in 27-31 rows ; ventrals 174-184; 
subcaudals 55-76 ; 13 upper labials . 20. cantoris, p. 551. 
3. Scales in 21-27 rows, strongly keeled ; ventrals 160-218; 
subcaudals 54-92 ; tail not or but slightly prehensile, 
a. 7 to 9 series of scales between the supraoculars ; scales in 
21 or 23 rows; ventrals 164-188 ; subcaudals 54-67. 
21. jerdonii, p. 551. 
b. 10 to 15 series of scales between the supraoculars ; scales 
in 23-27 rows. , 
Ventrals 183-218; subcaudals 72-92 .. 22. mucrosquamatus, 
Ventrals 182-186; subcaudals 72-74 ; [p. 552. 
supraocular large .........-00e00. 23. luteus, p. 553. 
Ventrals 160-182; subcaudals 55-76; 
supraocular very narrow, sometimes [p. 553. 
brokedl Up: s<.50:.<sessewamepeeaee 24. purpureomaculatus, 
4, Scales in 21 rows (rarely 19 or 23), smooth or feebly 
keeled ; 7 to 13 series of scales between the supraoculars ; 
tail:more or less prehensile. 
a. Temporal scales smooth ; subcaudals 53-82. 
Ventrals 145-175; snout feebly pro- 
minent; supraocular narrow........ 25. gramineus, p. 554, 
Ventrals 170-187; snout prominent, 
obliquely truncate;  supraocular 
MOTOW, fia cca sas bess +09 5 Cree 26. flavomaculatus, p.556, _ 
Ventrals 180-191; supraocular large .. 27. swmatranus, p. 557. 
b, Temporal scales obtusely keeled ; ventrals 138-158 ; sub- 
caudals 44-58 .......... 28. anamallensis, p, 558, 
5, Scales in 13-19 rows; 3 to 5 series of scales between the 
supraoculars ; tail prehensile. 
Scales smooth or faintly keeled, in 17-19 | 
rows; ventrals 145-170 ; subcaudals [p. 559. 
53-67 ......- PT Ee 29. trigonovephalus, 
