312 Explanation of Plates. 
EXPLANATION OF PLATE XVII. 
The offspring of a trophonius form of Papilio dardanus, sub-sp. 
cenea, observed laying eggs on May 4, 1904, at Bellair, five miles 
from Durban, Natal. The observation was made and the eggs 
collected by Mr. G. F. Leigh, but the female parent escaped. The 
figures represent eleven out of the thirteen offspring bred by Mr. 
Leigh from these eggs at Durban. The specimens are in the Hope 
Department, Oxford University Museum. 
All the figures are about 2 of the natural size. 
Fic. 1. Male offspring: pupated July 4, 1904; emerged August 5. 
The 10th to emerge. In this specimen the submarginal 
black band of the hind-wing is the least developed. 
There is however a slight trace of a narrow ‘‘sickle” 
partially closing the costal gap. 
Male offspring: pupated June 26, 1904 ; emerged July 31. 
The 8th to emerge. The costal gap closed by a narrow 
“ sickle.” 
3, Male offspring: pupated June 14, 1904; emerged July 25. 
The 5th to emerge. Although the costal gap is open 
there are traces of a black mark partially closing the 
inner gap. 
4. Male offspring: pupated June 12, 1904 ; emerged July 18. 
The 4th to emerge. Very similar to Fig. 3, but the 
costal gap is here completely closed. 
In this figure and the two succeeding it is seen that 
the inner border of the black margin of the fore-wing 
is distinctly serrated, recalling the appearance of meriones. 
5. Male offspring: pupated June 10, 1904; emerged July 5. 
The 2nd to emerge. Submarginal band of hind-wing 
slightly more developed, and the gaps slightly less than 
in Fig. 4. 
The meriones-like serration described under Fig. 4 here 
reaches its maximum development. 
6. Male offspring: pupated June 16, 1904; emerged July 27. 
The 6th to emerge. Hind-wing far more heavily marked 
than in any other of the male offspring, both gaps being 
completely closed. These males, emerging in July and 
August 1904, are as a whole far less heavily marked than 
those bred in November 1902 and November 1903, by 
Mr. G. F. Leigh. 
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