i86 
The Ohio Naturalist. 
[Vol. II, No. 3, 
arrangement of markings is later and the irregular the more 
primitive. 
This brief study has shown how variable some of the charac- 
ters really are. Some of these characters are used in classification, 
and varieties and even species have been proposed which were 
founded on no more fundamental characters than these. The 
c £ 
u ~ 
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£ 
( 1 ) 
0 _ 
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C « 
Z 5 *■£ 
1 2 1 
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0 
fc£C 
§ * « 
Length from 
anal plate c* 
to tail. 
( 4 ) 
C/j 
O 
bo 
0 4 / 
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44 0 
P 
(5) 
u_ 
0 5 
u O • ~ 
04 
B k B 
£ 
(6) 
oi 
«*- ca 
0 •g 
V- 0 
44 2 
2 2 
5 ~ 
£ 
( 7 ) 
(A 
04 
bfl 
44 
(0 
c 
fC w 
I 
265 mm. 
195 mm. 
70111m. 
146 
129 
3~3 
2 
261 
203 
58 
146 
1 29 
3 ~3 
304 33 
3 
263 
197 
68 
147 
130 
3-3 
4 
243 
189 
54 
i 43 
124 
3-3 
1 16, 135 
5 
244 
191 
53 
'47 
132 
3~3 
147 
6 
2»)2 
'95 
57 
144 
126 
3 3 
143 
7 
274 
207 
67 
• 5 ° 
133 
3-2 
8 
261 
197 
64 
142 
127 
2-2 
9 
260 
'93 
67 
'43 
128 
2 2 
IO 
2 53 
‘99 
54 
146 
129 
3-3 
28, 29, 30 
1 1 
265 
198 
67 
145 
128 
2-2 
1 2 
253 
‘97 
56 
143 
127 
2-2 
13 
261 
‘94 
67 
146 
130 
3 - 3 
14 
259 
'94 
65 
'44 
125 
2-3 
33 
15 
245 
190 
55 
'43 
127 
3-3 
142 
16 
254 
1S9 
65 
142 
126 
3-3 
17 
270 
200 
70 
146 
' 3 ' 
2-2 
l8 
257 
194 
63 
144 
128 
2-2 
'9 
267 
201 
66 
142 
126 
3-3 
30,31,32,141 
20 
263 
‘97 
66 
'45 
127 
3 2 
21 
247 
‘94 
53 
'47 
I 29 
3-3 
1, 2, 3 
22 
256 
‘95 
6l 
147 
132 
3-2 
2 3 
249 
190 
59 
144 
128 
2-2 
24 
24s 
'95 
53 
148 
132 
2 -2 
25 
250 
1 85 
6 5 
'45 
130 
3-3 
26 
261 
203 
58 
146 
128 
3-3 
27 
259 
194 
65 
143 
128 
2-2 
28 
255 
'99 
56 
'45 
128 
3-3 
29 
264 
‘97 
67 
'44 
12S 
3-3 
30 
268 
198 
70 
i 43 
123 
2-2 
3 i 
247 
190 
57 
144 
125 
2-2 
32 
250 
192 
58 
144 
128 
3-3 
143 
33 
257 
19X 
59 
147 
127 
3-3 
146 
Maximum 
274111111. 
207111111. 
70 mm. 
150 
'33 
3 ~3 
Minimum 
243 
1S5 
53 
142 
123 
2-2 
Difference 
3 1 
22 
17 
8 
IO 
1-1 
Mode 
26[ 
194-197 
67 
144 
128 
3-3 
Mean 
257 
'95 
6 3 
144 
128 
