55G Explanation of Plates. 



Fig. 23. Tenicohis achine 9? March 11, 1899. In this ami the two 

 preceding figures the unihiteral injury suggests an attack 

 un the wing. 

 24. Fijiameis eardui S, l^^^t'- 31, 1898. 



Explanation of Plate XII. 



Seasonal Phases of Butterflies op the Genus Precis. 



Representation of parent and offspring in Precis sesamns and P. 

 antilope. 



Demonstration of the seasonal phases of South African Butterflies 

 of the genus Precis. 



All the figures are about j^^ of tlie natural size. 



All the specimens represented were captured or bred by Guy A. 

 K. Marsliall. 



Fi<i. 1. Precis sesamns, form natnlensis 9) Salisbury, 5000 feet, 

 captured Feb. 27, 1898, after it had laid three eggs. 

 Parent of butterflies represented in Figs, la and 16. 



la. Precis sescnnns^ , offspring No. 1 of butterfly represented in 

 Fig. 1. Egg laid Feb. 27, hatched March 5, larva pupated 

 ^larch 31, imago emerged April 15. 



\h. Precis sesa^uts, form natalensis'^ , offspring No. 2 of butter- 

 fly represented in Fig. 1. Egg laid Feb. 27, hatched 

 March 5, larva pupated April 5, imago emerged April 20. 

 A distinctly dark individual showing some slight tend- 

 ency towards sesamns^ especially in the width of tlie 

 black margin of the hind-wings and the size of the blue 

 spots in this margin. 



These two ofl'spring show the overlap of summer and 

 winter phases remarkably well. The summer form, 

 Fig. lb, even appeared a few days later in the beginning 

 of winter than the winter form. Fig. la. At the same 

 time the former is unusiuilly dark. 



2. Precis sesamns, form natalensis $, Salisliury, 5000 feet, 

 captured March 6, 1898, after it had laid one egg. Parent 

 of butterfly represented in Fig. 2a. 



2a. Precis sesamns (^ , offspring of butterfly represented in Fig. 2. 

 Egg laid March 6, hatched March 12, larva pupated 

 April 7, imago emerged April 30. The last part of larval 



