73 
These variations may be represented in this manner: 
| | | | | | | Normal, 7. 
| I II Ill 1V | Vv | VI | VII | 
| | | WPeeae ale ress Increased, 8; 
I | II | Ila Ill IV | Vv | VI | VII Ila added. 
| ek || [ee seeer yk ar si Decreased, 6; 
| I | II | Ill & IV V | VI | VII | IIl-IV fused. 
The frequency of these variations in terms of percentage 
is as follows: 
Supralabials. Mainland, 9 sp. Island, 30 sp. 
5-6 la leal 
6 11.1 
6-7 11.1 Snod 
7 66.6 76.6 
7-8 Bac 16.6 
8 6.6 
The infralabial shields are normally 8. When the num- 
ber is increased to 9, it is by the addition of a shield between 
the normal VII and VIII; this added shield is referred to as 
Vila. 
| | | | . 
IT II Ill IV Vv VI VII | VIL | Normal, 8 
Increased, 9; 
I II Ill IV V VI Vea Vila Vill Z 3 
| | | | | Vila added. 
Infralabials. Pe 4 sp. Island, 9 sp. 
8 100 per cent 44.4 
8-9 apco 44.4 
9 at) Gal 
In this species when a change from the normal occurs it 
is brought about by the addition or loss of different shields 
than is the case in the genus Thamnophis, (Fitzinger) (1). 
Supralabials. Trop. vabakari. Thamnophis. 
7 increased to 8 Ila added. Ila added 
7 decreased to 6 III-IV fused VI suppressed 
Infralabials. 
8 increased to 9 Vila added. Illa added. 
SUMMARY OF VARIATION. 
The tabulated summary again emphasises the affinity 
between the Japanese and Chinese rather than between the 
Japanese and the Korean specimens. There is a fairly well 
marked line of demarkation between the Reptile and Batra- 
chian Faunas of Korea and Japan. This line runs parallel 
with the Korean Strait, passing to the east of Quelpart and 
Tsushima Islands. 
(1) 1908, Ruthven Bulletin No. 61, U. S. National Museum, p. 23. 
