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Psyche 
[December 
Hosts. — H. rufipes is nowadays primarily an ectopara- 
site of domestic equines (horses, mules, and donkeys). 
Although the type was said to have been obtained off an 
ostrich, it is more probable that the original host was one 
of the South African wild equines, Hippotigris quagga 
(Gmelin) or H . zebra (Linnaeus), both of them formerly 
common in Cape Colony. There is, however, no record 
of hippoboscids having ever been taken on these animals. 
H. rufipes is also found at times on cattle and will occa- 
sionally settle on dogs or on man. Bedford (1927, 11th 
and 12th Repts. Dir. Vet. Res. South Africa, I, p. 782) 
mentions having taken it on the blue wildebeest, Conno- 
choetes taurinus (Burchell), in the Northern Transvaal. 
The finding of this parasite on the East African eland, 
by Dr. J. P. Chapin, is also of special interest. 
H. Camelopardalis Roubaud was taken on giraffe, Giraffa 
Camelopardalis (Linnaeus), in Tanganyika Territory, by 
my friend, Dr. J. Rodhain. It appears to be identical with 
H. rufipes, to judge from the excellent figure and the brief 
description; the latter, however, does not mention any of 
the morphological characters here used to separate the 
species of Hippobosca. 
It was believed at one time by Sir Arnold Theiler that 
H. rufipes, as well as H. maculata Leach, were the carriers 
of a trypanosome ( T . theileri) found in the blood of cattle 
in the Transvaal. But the possibility of infection from 
other sources was not excluded in Theiler’s experiments. 
Moreover, Trypanosoma theileri is found all over the world, 
even in regions where cattle never are infested with hippo- 
boscids, so that the role of these flies as transmitters is 
most improbable. Noller’s recent work seems to indicate 
that certain tabanids are the normal carriers of T. theileri. 
Affinities. — These have been discussed under H. 
maculata . 
6. Hippobosca hirsuta Austen 
Hippobosca hirsuta Austen, 1911, Bull. Ent. Res., II, p. 
169, fig. la ( $ $ ; off waterbuck, Kobus defassa 
Riippell ; Mohokya, Toro Plains and northeast shore of 
