680 Mr. G. F. Leigh on Synepigonic series of 
A. albomaculata and the examples of A. echeria which 
converge towards it. Two or three cripples were liberated, 
but they were certainly cenea forms, probably white-spotted. 
I feel confident that no wild eggs or larvae were 
accidentally introduced with the food-plant, but cannot 
be equally sure about the pups. I was not then very 
familiar with these remarkably cryptic forms, and it is 
possible that one, or even two or three, may have slipped 
in unperceived. 
Comparison of the Individuals of the 1902 Synepigonic 
Group of PAPILIO CENEA. By EK. B. PouLton. 
A considerable part of the 1902 material had been 
dispersed before the present paper was written; but I 
have made a careful examination and comparison of the 
whole of the remaining specimens recently presented to 
the Hope Department by Mr. Leigh. These consist of 
8 females (6 cenea forms and 2 hippocodnoides forms) and 6 
males. In the first place it appears possible that the 
presence of one male and two female (white-spotted Natal 
cenea forms) specimens, which are distinctly larger than 
the others and also larger than the parents of the group, 
may perhaps be accounted for by the accidental introduction 
of wild pup with the food-plant. 
When the 6 females of the cenea form were minutely 
compared it was apparent that they are not divided into 
two distinct categories respectively characterized by the 
buff tint and by the white appearance of the five chief 
spots of the fore-wing. There was, on the other hand, the 
most perfect gradation of the one form into the other. 
The five chief spots may be indicated by numbers as 
follows :— 
(1) The largest spot, of an oval form, placed below the 
cell, between the Ist and 2nd median nervules. 
2) A spot, of which the form is usually oval, placed 
beyond the end of the cell, between the 2nd radial and 
3rd median nervules. 
(3) A roundish or oval spot, placed beyond the end of 
the cell, between the 5th sub-costal and Ist radial nervules. 
(4) A roundish or oval spot, with its outer border 
generally marked by a concavity. When the latter curve 
is strongly marked the spot becomes crescentic (as in 
Plate XX XI, Fig. 4) or reniform (as in Fig. 3). This spot 
