67 
having 25 rows, whereas one with 25 rows anteriorly and the 
V row terminating well forward at the level of the 10th gas- 
trostege would be recorded as having 23 rows. Another speci- 
men with 25 rows-anteriorly in which both the V and VI rows 
terminate a little behind the neck would be recorded as having 
21 rows. 
The point involved may be illustrated by the detailed 
scale formule of two specimens in the United States National 
Museum. These are mentioned in the Herpetology of Japan by 
Professor Leonhard Stejneger, the male as having 23, and the 
female 21 scale rows. 
Museum No... Sex. Rows. 25-V. 28-VI. 21-IV. 19-VII. 17-Continued, 
34040 ..... ° 23 17-12 70-79 1038-102 Continued. 
34024 1... fof 21 7-8 14-14 101-103 186-130 Continued. 
The scale rows may further vary, not only in the maxi- 
mum number that occurs anteriorly, but also in the mini- 
mum count that is found towards the base of the tail. This 
variation combined with the difference in the level to which 
a Suppressed row extends down the body, gives rise to two 
types of scale formule : 
25-23-21-19-17 (-V-VI-IV-VII) 
25-23-21-19 (-V-VI-IV) 
Detailed records of a few specimens poss essing these dif- 
ferent types may now be reviewed. 
FORMULA 25-23-21-19-17  (-V-VI-IV-VI). 
Museum. Locality. Sex. G. 26-V. 28-VI. 21-IV. 19-VII. 17-Cont. 
Cal. Ac Sci. 
31611 
Didier ENG Korea fof 148 14-20 98-90 107-107 140-134 
Ue S. N. M. 
A024 ce sie's Hondo fof 141 7-8 14-14 101-108 186-130 
Cal. Ac Sci. 
MOLUE Go Vay ice Hokkaido fof 136 6-5 11-11 106-110 182-1382 
Cal. Ac Sci, 
BOGE Va eaak. Ikishima fof 188 9-9 15-12 78-78 109-110 
Cal. Ac Sci. 
EES tae y ces Shanghai 2 145 9-9 56-47 108-106 124-125 
FORMULA 25-28-21-19 (-V-VI-IV). 
Museum. Locality. Sex. G. 26-V. 28-VI. 21-IV. 19-Continued. 
@Mhikoku 2 187 = 9-9 68-67 111-114 
Shikoku e 140 7-7 12-12 114-109 
Hondo Q 142 5-5 9-8 101-103 
436.. Hokkaido i 139 9-7 14-15 116-116 
Cal. Ac. Sci. 26141. Ikishima 2 140 18-14 72-70 = =102-102 
FORMULA 28-21-19 (-VI-IV). 
There are two specimens in the Vladivostok Museum. 
Nos. 515 and 522, from the Ussuri Province with this formula. 
The 19 row zone begins at the level of the 10th gastrostege. 
These are the only specimens recorded with this reduced 
