Stylocheiron longicorne
S. offine
I
lntermedia t
~ " ~ a l i f o r n i a current
./ CC.- E.I
4
Long form"
V " I
Eastern
ps 1,
__-.
ford'
0 .
IWl
equatorial form"
- . t . p I I
X
I
I1
c
5 1.5c
a
In
0
-
- *
-. -~
e\,tpm a,
am
I
Indo-Austmlian
form I'
. I
.
-
-
* * I
I
0
-
Intermediates W.E.-C.
\
-
-I
-
Central form"
\
-I
-
1
1
1
1
1
1
1
1
1
I
1
1
1
1
1
1
1
1
1
1
I
I
1
.
-
0.5
1.0
1.5
2.0
2.5
E/A Width of lower section of eye divided by width of upper section
FIG. 5. Method by which the five Pacific forms of Stylocheiron afiine and the two Paci6c forms of S. longicorne are distinguished.
The ratio of the proportions of the sixth abdominal segment (length/depth) is plotted against the ratio of the widths of the
upper and lower parts of the bilobate eye (see Fig. 4,l). (After Brinton, 1962a.)
0
4