36 Dr. G. B. LongstafE on 



of each sex at Tawila. In 1912 it was quite common in 

 gardens at Khartum and I saw several at Kadaru, ten miles 

 to the north. Moreover I either took, or saw, it at almost 

 every stopping-place on the White Nile, right up to Rejaf. 



The Rothschild party took eight at Nakhila. Cholmley 

 took it commonly north of Suakin. I saw several at Port 

 Sudan, while Yerbury found it at Aden. Peel took a male 

 at Sibi, West SomaUland, in 1895. It occurs also in 

 Uganda, at Mombasa, in German East Africa, and 

 at Yola in Nigeria. It is thus evident that this large 

 handsome swiftly-flying butterfly has a wide distribution. 



Butler remarks that specimens of this species almost 

 invariably arrive in a more or less broken condition. It 

 has a strong flight and is, I should imagine, long lived. 



The sexes are not remarkably different in appearance, and 

 the insect does not appear to vary otherwise than in size. 



In six males I have detected a slight scent, not easy to 

 describe. The words " dusty," " stuffy," " musky," 

 " pecuhar," " like wood," and " very faint Freesia " have 

 been apphed to it. (Compare 16. p. 510.) 



49. Teracolus halimede, Klug. 



This includes King's acaste, from Ambukol. Butler's 

 leo is a form or race of this species, but no marked line 

 can be drawn between it and the type ; coelestis, Swinhoe, 

 is not specifically distinct. 



King's types came from Ambukol, as well as from 

 " Arabia fehx and Arabia deserta." Consul Petherick 

 sent it home from the White Nile. Loat took a male and 

 two females near Kaka. Selous found it common at 

 Tawila and took a female opposite Renk ; all his specimens 

 would appear to have been of the form leo. The Swedes 

 took one of each sex on Abba Island ; these were assigned 

 by Aurivillius to var. acaste, Klug. 



In 1909 I took a number from Ad-Duwem [Lat. 14° 

 0' N.] to Gebel En [Lat. 12° 37' N.]. 



In 1912 I took in all twenty-two (many of the form leo) 

 on the White Nile, namely : on Abba Island five, at Tawila 

 nine, on Masran Island five, at Gebel En two, and at Kaka 

 one [Lat. 10° 40' N.]. 



So far as my information goes its Umits on the White 

 Nile are Lat. 14° 0' N. and Lat. 10° 40' N., with head- 

 quarters at Tawila [Lat. 13° 16' N.]. It is an insect not 

 easily overlooked. 



