small variations in the pattern of Papilio dardanus. 663 
but simply part of the general scheme of enlarged white 
areas in the Southern and Eastern form as compared with 
the Western. 
But the spot is, on the average, actually smaller in the 
Natal forms than in the Western forms, whereas the reverse 
in the case with the large white areas which are of most 
importance for the mimetic resemblance. Furthermore 
the 7 hippocodn offspring of the female planemoides, 
like the other examples of hippocoén from Uganda, belong 
to the Western and not to the Eastern type; and yet the 
spots of these 7 specimens are the largest of all. 
SPOT-CELL-RATIO IN HIPPOCOUN OFFSPRING FROM A 
PLANEMOIDES PARENT (BUGALLA ISLAND) AND FROM SIX 
HIPPOCOON PARENTS (LAGOS DISTRICT). 
