the Butterflies of the White Nile. 29 
Family PAPILIONIDAE. 
Sub-family PIERINAE. 
36. Herpaena ertphia, Godart (= melanarge, Butler), 
f. lactecpennis, Butler; the extreme dry-season form 
is termed by Aurivillius straminea. 
Found by Dunn on the Bahr al-Zarafa. A very small 
example (1’’ 34’’’ = say 33 mm.) of the extreme “ dry ”’ 
form was taken by Selous at Tawila [Lat. 13° 16’ N.]. 
The Swedes took two males of the form straminea at Gebel 
En and Kaka respectively : the alar expanse of these was 
31 mm. and 38 mm. 
I took a very small example of each sex at Tawila in 
1909. In 1912 I took another at the same place, as well 
as three on Masran Island [Lat. 12° 45’ N.] and three more 
at Renk [Lat. 11° 45’ N.]: these were all small. 
Klug’s specimens of Pontia tritogenia, which is not dis- 
tinguishable from ervphia, were taken at Ambuk6l in July 
and August. There is a specimen in the Coll. Hope labelled 
“ Nubia.” 
On the White Nile, however, the above records indicate 
a distribution limited by the latitudes 13° 16’ and 10° 40’ N. 
This insect is found all along the eastern side of Africa, 
in Madagascar, throughout South Africa, and it has been 
recorded from Senegal. 
Yerbury records H. zterata, Butler, for Aden: Aurivillus 
(3. p. 31) seems to doubt whether it is specifically distinct. 
This form is also recorded for Somaliland, as well as for 
German East Africa, and British East Africa. 
37. Belenois gidica, Godart, including f. abyssinica, Lucas 
(Northern form), and f. westwoodi, Wallengren. 
Capt. Dunn took the form abyssinica on the Bahr al- 
Zarafa, and Loat took several of the same form near Kaka, 
as well as two at Gondokoro. The Swedes took a male of 
£. westwoodi at Gebel En [Lat. 12° 37’ N.], and two males 
of the form abyssinica at Renk. 
In 1912 I found it common at Gebel Ahmed Agha [Lat. 
11° 0’ N.], and took a few specimens at Kaka, Kanisa, 
Mongalla, Lad6, Gondokoro, and Rejaf. 
It will be seen that I have no record of this common 
