the Butterflies of the White Nile. 17 



Family NYMPHALIDAE. 



Sub-family DANAINAE. 



1. Dariaida chrysippus, Linn. 



The Sudan is an interesting region in which to study 

 this very widely distributed species, since all its forms are 

 met with, often all together. 



a. The typical, or chrysippus form. This varies much in 

 the depth of the ground-colour, moreover a large number 

 of the specimens met with in this part of Africa have the 

 veins of the hind-wings more or less dusted with white 

 scales. 



Dunn took it on the Bahr al-Zarafa.* Loat took four 

 males near Kaka, also a number of males and one female 

 at Gondokoro. Dr. Dixey notes that several of Loat's 

 specimens had " a slight white powdering round the gland 

 patch." The Swedes took it both at Khartum and at 

 Kaka. 



In 1909 I took a male at Gebel En, another at Kosti, and 

 a third on Abba Island. At Khartum, where the species 

 was common, somewhat more than one-fourth of all the 

 specimens observed were of the chrysippus form. In 1912 

 though I saw a few D. chrysippus at Khartum I did not pay 

 much attention to them, but a typical female was captured 

 at Kanisa [Lat. 6° 50' N.] and two at Rejaf, my most 

 southerly point. It may accordingly be said to occur 

 throughout the White Nile region. 



The wide distribution of D. chrysippus throughout 

 Africa and the Oriental region is well known, but attention 

 may be called to the curious fact that Dr. Dixey did not 

 find a single typical example among Peel's twenty-two 

 specimens from Somahland. Two specimens taken by 

 Bennett in Sokotra have the veins of the hind-wings white. 

 On the other hand, there is no trace of such white on the 

 hind-wings of any of my Egyptian specimens ranging from 

 Cairo to Aswan. The specimens taken by the Rothschild 

 party on the Atbara were typical. 



/?. Form alcippus, Cram., including alcippoides, Moore. 

 Under this I include all individuals with more or less white 

 hind-wings. 



Taken by Capt. Dunn on the Bahr al-Zarafa, also by 



* So far as I can make out Capt. Dunn's insects must have been 

 taken in about Latitude 9° N. 



TRANS. ENT. SOC. LOND. 1913, — PART I. (JUNE) C 



