170 ERNEST E. AUSTEN—-NEW AFRICAN HIPPOBOSCIDA, 
Head shining straw-yellow, sides of front shining buff-yellow, frontal stripe 
dull Vandyke-brown ; palpi dark brown, clothed with hair of same colour and 
character as that on head itself; inner margins of sides of front fringed with 
long hair, Thorax: Naples-yellow markings on dorsum (except scutellum) of 
same kind as those exhibited by Hippobosea maculata, Leach, and I. camelina, 
Leach, but much less distinct and sharply defined ; in front of transverse suture, 
transverse mark behind each humeral callus, though present, is usually less distinct 
than it appears in fig. 1 a, while in middle line, and resting on transverse suture, 
the lateral arms of the mark that in case of H/. maculata resembles a cruciform 
sword-hilt are shortened and rounded off, much as they are in //. camelina ; 
behind transverse suture the median rhomboid mark seen in /Z, maculata has 
disappeared, and the admedian marks, instead of having definite outlines, as is 
usually the case in H/. maculata, are ill-defined and more or less indistinet (cf. @ 
and c, fig. 1); basalangles of scutellum Naples-yellow; hair on pectus paler, 
finer, and denser than on dorsum. Wings: sepia-coloured, principal veins 
dark brown. Legs: \ast joint of middle and hind tarsi dark brown above ; 
claws black. 
UGANDA PROTECTORATE: type of 3, type of Q, and one other Q from 
Mohokya, Toro Plains, 14. III. 1911 (Dr. R. A. L. Van Someren); also 
2 3 ¢ from the vicinity of the north-east shore of Lake Ruisamba (or Dweru), 
South Toro, 1910 (Captain F. P. Machie, IL.M.S., per Colonel Sir David 
Bruce, C.B., A.M.S., F.RB.S.). 
All the foregoing specimens, as well as those enumerated below as belonging 
to a variety of Iippobosca hirsuta, were caught on Waterbucks (Kobus defassa, 
Riippell), on which antelope this fly would consequently appear to be specially 
parasitic. Whether indeed it occurs on any other species of game cannot yet be 
stated. As regards the possibility of its playing a part in the dissemination of 
animal trypanosomiases, while prolonged experiments and observations will of 
course be needed in order to determine whether HH. hirsuta ever acts as a disease- 
carrier if it should find its way on to domestic animals, it may be interesting to 
note that, when writing to the author from Toro, in February last, Dr. Van Someren 
mentioned that he had “ infected a monkey with these fly caught on a Waterbuck, 
whose blood showed trypanosomes (? J’. pecorum, Bruce).” 
While evidently allied to Hippobosca maculata, Leach, reddish specimens of 
which it resembles in general appearance, HZ. hirsuta, in addition to the differences 
in the thoracic markings described and illustrated above, is distinguishable from 
that widely distributed species by the much greater width of its front and frontal 
stripe,* the hairiness of the dorsum of the thorax, and the absence of a dark 
brown, elongate patch on the inside of the distal extremity of the hind tibia. 
The infuscation of the distal extremities of the middle and hind femora in 
H, maculata, though often very extensive and much more so than the corre- 
sponding markings in the case of MH. hirsuta, is subject to considerable 
individual variation, and cannot be relied upon as a distinctive character. 
From Hippobosca camelina, Leach, H. hirsuta, apart from its smaller size, may 
be distinguished by the indistinctness of the post-sutural, admedian, thoracic 
* These differences are unfortunately not brought out with sufficient clearness in the figures. 
