36 Dr. G. B. Longstaff on 
of each sex at Tawila. In 1912 it was quite common in 
gardens at Khartim and I saw several at Kadart, 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 
Sadan, while Yerbury found it at Aden. Peel took a male 
at Sibi, West Somaliland, in 1895. It occurs also in 
Uganda, at Mombasa, in German Kast 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,” 
“peculiar,” “ like wood,” and “ very faint Freesia’’ have 
been applied to it. (Compare 16. p. 510.) 
49. Teracolus halimede, Klug. 
This includes Klug’s acaste, from Ambukél. 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. 
Klug’s types came from Ambukél, as well as from 
“‘ Arabia felix 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 Aurivillus to var. acaste, Klug. 
In 1909 I took a number from Ad-Duwém [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 limits 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. 
