the Butterflies of the White Nile. 17 
Family NYMPHALIDAE. 
Sub-family DANAINAE. 
1. Danaida chrysippus, Linn. 
The Sidan 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-Zaradfa.* Loat took four 
males near K4ka4, 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 Khartiim and at 
Kaka. 
In 1909 I took a male at Gebel En, another at Kosti, and 
a third on Abba Island. At Kharttim, 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 Kharttim 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 Somaliland. 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. 
B. 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.—PARTI. (JUNE) Cc 
