7 ERNEST E. AUSTEN—NEW AFRICAN HIPPOBOSCIDZ., 
from front to rear; frontal stripe (in dried specimen) clove-brown ; face raw- 
umber-coloured in centre, dark brown on each side below; jowls and under 
surface of head on each side mummy-brown, central area of under surface 
of head ochraceous buff; under surface of head clothed with bright, ochre- 
yellow hair; palpi relatively rather narrow (from above downwards) and 
elongate, their outer surfaces dark brown or clove-brown, and clothed with 
brownish hair; visible portion of anxtenne shining dark brown, clothed with 
black hair. Thorax: humeral calli raw-umber-coloured, dark brown behind, 
clothed above with black mixed with ochre-yellow hairs ; portion of dorsum 
immediately behind humeral calli, and in front of transverse suture, clothed 
with appressed, ochre-yellow hairs; hind margin of scutellum and portion 
of thorax immediately in front of scutellum also clothed with ochre-yellow hairs ; 
pleure blackish and clothed with similarly-coloured hair ; pectus raw-umber- 
coloured. Abdomen clothed for most part with black hair. Wings: principal 
veins and thicker portions of veins clove-brown or dark brown. Legs: front 
tibia and tarsi, and under surface of front femora (in dried specimen at any rate) 
more or less raw-umber-coloured ; under surfaces of middle and hind femora and 
tibie (in dried specimen) more or less mummy-brown ; legs clothed for most part 
with black or blackish hair ; claws black. 
Ucanpa Protectorate: Nsadzi Island, Lake Victoria, 23. I. 1911, on 
fish eagle, Haliactus vocifer, Daud. (Dr. H. L. Duke). 
Although closely allied to and resembling Olfersia (Ornithomyia) intertropica, 
Walk.,* the species described above is distinguishable by its more elongate and 
darker palpi, by the hairs and punctures on the inner borders of the sides of the 
front being fewer in number and coarser, and especially by the different shape of 
the shining plate on the vertex, which is more transversely elongate, and the 
anterior angles of which are more abruptly rounded off. 
Dr. Duke, in whose honour the species is named, states that he met with two 
specimens of O. dukei on a fish eagle shot by him at the water’s edge. The type 
specimen was moving about under the feathers ; the other, which was not caught, 
flew round the dead bird, settled several times on Dr. Duke, and ran under his 
coat, but did not bite him. It flew like a Tsetse, settled abruptly, and followed 
for some fifty yards. 
* O. intertropica, Walk., isa widely distributed species which, in the Sandwich Is. at any rate, is 
parasitic on the short-eared owl : it has not been recorded from Africa, but, besides occurring in 
the Sandwich Is., is also found in Mexico and Brazil. As stated elsewhere by the present writer 
(cf. Ann. and Mag. Nat. Hist., Ser. 7, Vol. xii, p. 264, 1903), Olfersia acarta, Speiser, is 
apparently a synonym of this species. 
