o5G Explanation of Plates. 



Firx. 23. Tcmcolus achine $, March 11, 1899. In tins and the two 

 preceding figures the unilateral injury .suggests an attack 

 on the wing. 

 24. Pijrameis cardui ^, Dec. 31, 1898. 



Explanation of Plate XII. 



Seasonal Phases op Butterflies of the Genus Precis. 



Representation of parent and offspring in Precis sesamns and P. 

 nntilope. 



Demonstration of the seasonal phases of South African Butterflies 

 f)f the genu.s Precis. 



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



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

 K. Marshall. 



Fig. 1. Precis sesamns, form natalensis $, Salisbury, 5000 feet, 

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

 Parent of butterflies represented in Figs, la and 16. 



lu. Precis sesamns,^ , offspring No. 1 of butterfly represented in 

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

 March 31, imago emerged April 15. 



lb. Precis sesamns, form nataloisis '^ , 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 the 

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

 spots in this margin. 



These two offspring sliow 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. 1«. At the same 

 time the former is unusually dark. 



2. Precis sesamus, form natalensis $ , Salisbury, 5000 feet, 

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

 of butterfly represented in Fig. 2a. 



2((. 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 



