18 Dr. G. B. LongstafE on 



Loat near Kaka and at Gondokoro. The Swedes took it 

 at Khartum, also near Kaka. 



In 1909 I met with it commonly at Khartum, where I 

 estimated that more than half the chrysippus were of this 

 form : I also took a male of the extreme alcippus form 

 at Ad-Duwem. 



In 1912 I took one at Khartum, another on the battle- 

 field of Kerreri (about nine miles N.W. of Khartum), and 

 saw others at both places. I also captured single indi- 

 viduals at Abba Island, Shambi and Gondokoro. 



From these records it may be fairly said that the distri- 

 bution of alcippus covers the whole White Nile district. 



Rothschild does not record it from the Atbara. Though 

 it is common at Port Sudan and at Aden, no specimens 

 were found in the Peel collection from Somaliland, nor in 

 the Bennett collection from Sokotra. 



ry. Form dorippus, Klug [called by some authors 

 klugii, Butler]. This lacks the transverse white band 

 across the fore- wing near the tip, but normally has the 

 hind-wings, on the upper surface, of the ground-colour. 

 Aurivillius (3. p. 72) considers this a distinct species, a 

 view in which probably he now stands alone. 



Capt. Dunn took it on the Bahr al-Zarafa. Loat met 

 with it both at Kaka and Gondokoro. It was taken by 

 the Swedes at Khartum. The Rothschild party took it on 

 the Atbara, as well as at Khartum. 



Personally I did not come across this form in 1909, but 

 in 1912 took a single example at Khartum. 



It is a common insect both at Port Sudan, and at Aden. 

 Cholmley met with it to the north of Suakin, while Peel 

 found it the dominant form in Somaliland. 



d. Form albinus, Lanzknecht [called by some authors 

 dorippus, Klug]. This, which may be said to combine in 

 one the two deviations from the type, in that while lacking 

 the white bar on the fore-wings, it has the hind-wings more 

 or less white, would appear to be by far the scarcest form 

 of chrysippus. Aurivillius (3. p. 72) regards albinus as an 

 aberration of dorippus. 



Capt. Dunn found it on the Bahr al-Zarafa. Loat took 

 a specimen near Kaka and four at Gondokoro. In 1909 I 

 took a single specimen at Khartum. 



It occurs at Port Sudan, also at Aden. It seems fair to 

 assume, though the data are imperfect, that dorippus and 

 albinus occur throughout the White Nile district. 



