TAiSANUS f*ROM THK ANGLO-EGYPTIAN SUDAN. 175 



distal extremities of middle and hind tibiix; (in Q sometimes also lower surface of 

 hind tibia;) clove-brown ; front tibiaB in Q, except distal fourth, clothed with 

 minute, appressed, glistening white hairs, pale portions of middle and hind tibiie 

 in Q clothed with similar yellowish white hairs. 



Anglo-Egyptian Sudan : type of (5 from Khor Arbat, lied Sea Hills, 

 9. IX. 1909, type of Q and one other Q from same locality, 11 & 12. IV. 1910, 

 " attacking camels " (H. H. King). 



Tahaiius camelarius is allied to and superficially resembles T. 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, 

 Avhich is clove-brown instead of raw-umber-coloured or mummy-brown ; by the 

 antenniw 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 

 fourlli 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 clot/ied with minute, yellowish or ivhitish hairs ; dorsum of abdoinen with a more 

 or less distinct, median, longitudinal stripe (composed of elongate, grey triangles, with 

 tlwir apices directed forwards and truncate), between luhich 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 antenna produced 

 into a very prominent, shining black transverse protuberance, on the under surface of 

 irhich the antennce 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 antenna;) and 

 the region between each antenna and the corresponding eye ; lower margin of 

 shining black protuberance straight (sometimes emarginate in centre below 

 antenna;), extending from eye to eye just below the level of the antennjc, 

 and forming a sharp contrast with the white face ; frontal callus (situate 

 just above but not in contact with supra-antennal protuberance) raw- 

 umber-colovu'ed, transversely elongate and flat ; pcdpi 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 ; antennm 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 



