288 
THE AMERICAN NATURALIST. 
Percent 76 2 m 82 td 86 
4 
fa ce HHRHH FH 
EEREEEEM m sum un 
HHHH HHH 
Pasan 
EERE jas 
SRT 
sot — 
FE HAE 
EENE 
Hes ic 
IUE 
IO H 
L— 
Fig. 7A. E 
=H 
E i : 
EX una HHHH 
HE HH H4 || 
Fig. 7B. 
HA 
EHA 
eae tana 
m we am omn a Saw a o7 
HHHL i [] 
Fic. 7. — Frequency polygons for 
4 
melanism of top of head 
males from entire region; B, 57 
ustr rian sub- 
noran subprovinc 
