558 E.rplanation of Plates. 



hind-wings and the more distinct white markings in the 

 black marginal band, on the under-side ; also by the 

 paler tint of the ground -col our, making a stronger 

 contrast with the black markings. 

 Fig. 2. Precis sesamns 9 j under-side of wings ; Salisbury, 5000 feet, 

 captured April 2, 1898. Even in the absence of colour 

 the astounding difference between this and the wet-season 

 phase (see Fig. 1) is clearly shown. 



3. Precis sesamus, form natalensis ^ , strongly tending towards 



the dry phase, under-side of wings; Machakos, British 

 East Africa, captured June 6, 1900, by Mr. and Mrs. S. 

 L. Hinde. This beautiful variety stands well on the wet, 

 or red, sitle of intermediate. 



4. Precis ant Hope, form simia $, under-side of wings ; Salis- 



bury, Feb. 23, 1902. Parent of butterflies represented in 

 Figs. 4a and 46. This figure shows the under-side of the 

 specimen represented in Fig. 3, Plate XII. It is seen 

 that the under-side is much more conspicuous than the 

 upper in the points mentioned above in the description 

 of P. sesamus, form natalensis (Fig. 1) ; especially in the 

 far greater contrast between the lighter ground-colour 

 and the black niarkings and in the amount of white in 

 the black border. 



4(f. Precis antilope $ , under-side of wings. Offspring No. 1 of 

 butterfly represented in Fig. 4. This figure shows the 

 under-side of the butterfly represented in Fig. 3«, Plate 

 XII. The dift'erence between the under-side in oft'spring 

 and parent is as astonishing as in the two phases of 

 sesanins, while the difference in shape of the wings is 

 even more remarkable. 



4b. Precis antilope ^ , under-side of wings. Offspring No. 2 of 

 butterfly represented in Fig. 4. Tiiis figure shows the 

 under-side of the butterfly represented in Fig. 3h, Plate 

 XII. The great dift'erence in the character of the under- 

 side in the two oft'spring (compare this figure with the 

 jjreceding) is well shown, although both represent dead 

 leaves equally well. 



5. Precis archesia, form pclasgis ^ , under-side of wings ; Salis- 



bury, 5000 feet, captured Dec. 11, 1897. The figure 

 shows well that the difference between the two phases of 

 this species is far more important upon the under- than 

 the upper-side. It is also seen that the pale, conspicuous, 

 sharply-outlined, black-spotted band of the wet phase 

 represents the intensely cryptic mid-rib-like streak of the 



