176 ERNEST E. AUSTEN—TWO NEW SPECIES OF 
grey on front margin, and with a grey stripe on each side, a narrow grey median 
line extending from front margin to a little beyond transverse suture, and a 
complete grey stripe between median line and each lateral stripe ; viewed from 
the side, an ill-defined dark brown horizontal mark, partly clothed with black 
hair, is seen extending from base of wing towards humeral callus ; pleure and 
pectus light grey, and clothed with white hair; scutellum clothed above with 
appressed, yellowish hair. Abdomen: the series of truncate triangles forming the 
median dorsal stripe extends from the base of the abdomen to the hind margin of 
the fifth segment, and the triangles, like the spots, are clothed with appressed 
yellowish hair ; the paired light grey spots are present on the first six segments, 
and are disconnected ; spots on first segment connected with grey covering of 
basal angles, spots on following segments usually connected, more or less eines 
with hind margins ;_ posterior saye ee of first six segments, and extreme hind 
margins of second to sixth segments inclusive cream-buff ; lateral margins of first 
four segments grey, clothed, as also are posterior angles of first six segments, 
with whitish hair ; venter grey, first four segments and posterior angles of fifth 
clothed with minute, appressed, whitish hairs, sixth and seventh segments and 
median portion of fifth clothed with black hair ; a broad slaty-black median stripe 
extending from front margin of second to hind border of fifth segment ; sixth and 
seventh segments (except hind border of sixth) black ; hind borders of second to 
sixth segments inclusive cream-coloured. Wings hyaline, veins dark brown ; 
stigma elongate, dark brown and conspicuous ; base of anterior branch of third 
longitudinal vein without an appendix. Halteres: knob cream-coloured, dark brown 
at base ; stalk cream-buff, dark brown at distal extremity. Legs slate-grey, tarsi 
and distal extremities of tibie clove-brown or black, front half of proximal two- 
thirds of front tibie crearn-coloured, corresponding portion of middle tibie and 
proximal two-thirds of first joint of middle tarsi cream-buff, extreme base of first 
joint of hind tarsi also cream-buff, coxe, femora, and front surfaces of tibie 
(except distal extremities) clothed ith whitish hair. 
ANGLO-HGYPTIAN SuDAN, and SOMALILAND: type and two other specimens 
from Khor Arbat, Red Sea Hills, Anglo-Egyptian Sudan, 9, 10. IX. 1909 
(H. H. King); a fourth specimen from Karora, Red Sea Province, Anglo- 
Egyptian Sudan (near the frontier of Eritraea), February, 1909 (forwarded by 
Mr. H. H. King); a fifth specimen from Heile Madow, R. Webi, Somaliland, 
. XI. 1908 (Dr. R. E. Drake-Brochman). 
At Karora, according to information supplied by Mr. King, Vabanus mordax 
and 7’, leucostomus, Liw., which it closely resembles, are termed “lamas” by the 
natives, by whom the bites of both species, as also those of Pangonia magretti, 
Bezzi, are said to be fatal to camels. 
The resemblance between Tabanus mordax and T. leucostomus Lw.*, is so 
close as to suggest that the former may ultimately prove to be a form of the 
* Syn. 7. psusennis, Senn.—T. leucostomus, Lw., the type of which was obtained on the 
Kuisip River, German S.-W. Africa, also occurs in Somaliland and Abyssinia, while a female of 
this species, taken at Karora, Red Sea Province, Anglo-Egyptian Sudan, at the same time as the 
female of 7. mordax referred to above, was presented to the British Museum (Natural History) 
with the latter, by Mr. H. H. King. 
