lit 
DIAGRAM OF VARIATION 
61 
.O 
c; 
£ 
_ Bill 
4 _ Tarsus 
_ Mid. 7 
Phonygama atra \ 
1 
1 
Mil 
Oriolus galbula J 
i 
[ill 
Pica caudata \ 
1 
1 l . 
r 
Semeioptera wallacei 
1 
I I 
Pgrrhocorax alpinus 
i I i 
Fia. 8.—Variation of Birds in Leyden Museum. 
