TABANUS FROM THE ANGLO-EGYPTIAN SUDAN. eo 
distal extremities of middle and hind tibiew (in Q sometimes also lower surface of 
hind tibie) clove-brown ; front tibia in Q, except distal fourth, clothed with 
minute, appressed, glistening white hairs, pale portions of middle and hind tibie 
in Q clothed with similar yellowish white hairs. 
ANGLO-EGYpTiAN SuDAN: type of $ from Khor Arbat, Red Sea Hills, 
9. IX. 1909, type of © and one other © from same locality, 11 & 12. [V. 1910, 
“attacking camels” (HZ. H. King). 
Tabanus camelarius is allied to and superficially resembles 7. gratus, Lw., 
but, in the female sex at any rate, is distinguishable inter alia by the larger size, 
more conspicuous appearance, and much darker coloration of the frontal callus, 
which is clove-brown instead of raw-umber-coloured or mummy-brown ; by the 
antenne being darker, with a less prominent angle on the third joint, and the 
terminal annuli dark brown or clove-brown instead of ochraceous-rufous ; by the 
median grey abdominal stripe (except on the sixth segment) being of practically 
uniform width throughout, instead of conspicuously expanded on the third and 
fourth segments, and by the paired grey abdominal stripes being, instead of con- 
tinuous, broken up into disconnected spots after the second segment; and lastly 
by the femora being slate-grey, instead of isabella- or fawn-coloured. 
Tabanus mordax, sp. n. 
Q.—Length (5 specimens) 12 to 15°4 mm.; width of head 3°75 to 5 mm. ; 
width of front at vertex just under 1 mm, to 1 mm.; length of wing 8'2 to 
10°4 mm. 
Slaty-black: dorsum of thorax covered with a thin greyish bloom, striped with grey, 
and clothed with minute, yellowish or whitish hairs ; dorsum of abdomen with a more 
or less distinct, median, longitudinal stripe (composed of elongate, grey triangles, with 
their apices directed forwards and truncate), between which and lateral margin on 
each side is a longitudinal series of very conspicuous and sharply defined, oblique, 
oval, light grey spots; lower portion of front immediately above antenne produced 
into a very prominent, shining black transverse protuberance, on the under surface of 
which the antenne themselves are situated. 
Head: front and occiput grey, face white and clothed with white hair ; front 
relatively broad above, narrower below, its uppermost portion clothed with short, 
black hairs ; shining black supra-antennal protuberance extending from eye to 
eye, and including the sub-callus (the area immediately above the antenne) and 
the region between each antenna and the corresponding eye; lower margin of 
shining black protuberance straight (sometimes emarginate in centre below 
antenne), extending from eye to eye just below the level of the antenna, 
and forming a sharp contrast with the white face; frontal callus (situate 
just above but not in contact with supra-antennal protuberance) raw- 
umber-coloured, transversely elongate and flat; palpi cream-coloured, proximal 
joint clothed with long, white hair, terminal joint swollen, not elongate but ending 
in a sharp point, and clothed on outer side with short, appressed, glistening white 
hairs, mingled with minute black hairs towards distal extremity ; antenne entirely 
black, clove-brown or dark brown, expanded portion of third joint not particu- 
larly broad, and the angle on its upper margin not prominent. Thorax: dorsum 
